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9/2/2014 12:07 A.M. ET

Finnegan takes quick trip to big leagues

KANSAS CITY -- Clubhouse leader and pitching ace James Shields good-naturedly made sure the raw rookie knew his place.

Left-hander Brandon Finnegan, drafted into pro ball just last June, already had landed with the Royals and was sandwiched in a locker between Shields and another veteran pitcher, Jason Vargas.

Measuring a horde of reporters eager to interrogate Finnegan, Shields carefully placed a bat on the floor as a boundary marker for the kid and the press.

Was Finnegan nervous in his first day in the Major Leagues?

"Yeah, definitely," he said. "These big-name guys, Shields, Vargas, Wade Davis. It's unreal. It's definitely something I'm going to have to take in and hopefully get a good experience out of it."

Finnegan was among three players from the Double-A Northwest Arkansas roster tabbed on Sunday to become September callups for the Royals. Finnegan and outfielder Lane Adams arrived on Monday. Outfielder Terrance Gore was expected on Tuesday.

Three other players, pitchers Aaron Crow and Liam Hendriks and infielder Christian Colon, are due to return Tuesday from their temporary assignment with Northwest Arkansas.

Finnegan, who was in the College World Series with TCU, was selected in the first round of the First-Year Player Draft by the Royals in June. He began as a starter with Class A Wilmington, then was sent to Northwest Arkansas to work in relief in anticipation of this move.

"When we break it down and look at it, he was one of the best options we had out of the left-handed side," said manager Ned Yost. "Let's go with it. We're looking for good arms, for guys we feel can compete up here. He fit all the prerequisites."

Finnegan got the word from Naturals manager Vance Wilson on Sunday. The pitcher's mother happened to be in Springdale to watch some games.

"She went into tears. It's definitely different than anything we've experienced. It's new to us. It's awesome," he said.

Finnegan is from Fort Worth and could make his Major League debut against his hometown team.

"I grew up a Rangers fan. Out of high school I got drafted by them. But we're enemies now," he said.

Yost said he'd ease Finnegan into action.

"All the reports say that this kid can help us. He's got good stuff, he's real competitive on the mound and he throws strikes," Yost said. "I don't have a master plan on how I'm going to use him day to day."

Adams made his big league debut during the Royals' 4-3 win over the Rangers, running for Raul Ibanez at first base in the eighth inning. He advanced to second base on a wild pitch.

"Lane Adams we brought up primarily to pinch-run. We've got guys in the middle of our order that aren't real fleet afoot," Yost said. "And then if something happens, he's a real good defender in the outfield. He's got power, too."

The ultra-fast Gore is also ticketed for pinch-running duty, although he has yet to report. His locker awaits, however, with uniform No. 0.

The Royals haven't had a zero on a player's back since George Scott in the club's first year, 1979.

Hosmer returns to Royals lineup

KANSAS CITY -- Eric Hosmer is back.

The Royals recalled Hosmer, their regular first baseman, from his injury rehabilitation assignment with Triple-A Omaha on Monday after just two games with the Storm Chasers. He went 3-for-10 with a home run, a walk and three RBIs.

On Sunday night, Hosmer's homer helped Omaha secure a spot in the Pacific Coast League playoffs, but his rehab stint was declared over.

"We need offense and after the game last night, our scouts that were there watching said he's ready. So we got him back up here, see if we can get some runs on the board," manager Ned Yost said.

Hosmer last played with the Royals on July 31.

"It feels good to be back with the guys here and I've heard that the rehab process takes a long time but once we started hitting and started to do some baseball activity, it really sped up and went by pretty quick," Hosmer said.

There was added incentive because of the Rangers' starting pitcher on Monday night.

"You look at Colby Lewis, we need some offense," Yost said. "Lefties are hitting like 60, 70 points higher off him so we put [Carlos] Peguero in there, Raul [Ibanez] in there, Hoz in there -- we've got to get some offense going."

Hosmer went 1-for-4 in his return -- getting a single off Lewis -- and stole a base. He also booted a ground ball, the Gold Glover's seventh error this year.

Hosmer sustained a stress fracture of his right hand when hit by a pitch July 20 at Boston, but he tried to play off and on until going on the disabled list on Aug. 1.

"That's all behind me now," Hosmer said. "It's been four or five days of constant batting practice and the games in Omaha. So we've been putting a lot of work on it and it hasn't been sore, it's responded well so it's all good and we can finally put that behind me and it's fully healed up and ready to go."

Before going on the disabled list, Hosmer aggravated the injury with a check swing.

"There were a couple of awkward swings in Omaha. I swung through a changeup on one and didn't feel anything. And there was an offspeed pitch away and I had to foul it off. I didn't really feel anything on that, either," he said. "Those are definitely good signs because that's what irritated it last time. We got in game situations, we've done everything we can, so it's back and ready to go."

During Hosmer's absence, the Royals got hot and climbed into first place so he's anxious to get into the pennant race.

"Each game is a big game, it's basically a playoff game for us," he said. "It's September 1 and you're at the top of your division. There's not a much funner situation to come into."

Peguero heads lists of September callups

KANSAS CITY -- Carlos Peguero finished Triple-A Omaha's rain-delayed game about 1:30 a.m. on Monday morning and was called into manager Brian Poldberg's office. Pack your packs and head for Kansas City, he was told.

So he got some sleep, drove to Kauffman Stadium and saw his name in the Royals' starting lineup for Monday night's game against the Rangers. Peguero packs a powerful left-handed bat -- he hit 30 home runs for the Storm Chasers.

In addition to Peguero, the Royals on Monday announced that infielder Johnny Giavotella, catcher Francisco Pena and pitcher Casey Coleman were being called up from Omaha.

The Royals also announced that Omaha pitchers Chris Dwyer and Blake Wood were designated for assignment, clearing 40-man roster space for incoming pitcher Brandon Finnegan and Peguero.

Was Peguero surprised that he was in the lineup?

"Not really, every time you come here with a baseball team you've got to set your mind to be ready every day and think about how I can help the team win," Peguero said. "We're in good position here now and I'm just going to try to enjoy my time here. The guys that are here are the guys that I saw this year in Spring Training so it's an honor for me."

Manager Ned Yost was quick with his pencil.

"We sorely need some offense, we just got through playing four games where if we had just a little bit of offense, we'd have won all four of them," Yost said. "The pitching was great, the defense was great. So we're just looking for a way to score some runs."

Peguero pitched right in during the Royals' 4-3 victory. He belted a double to left field and then scored on Mike Moustakas' single. He also demonstrated a cannon throwing arm from right field, holding Adrian Beltre to a single on a ball off the wall.

Of Peguero's 30 homers, 15 came in August alone.

"He got hot, it's as simple as that," Yost said. "He 's got good power, that's why we put him in there. We don't want him sitting around getting cooled off. We need some offense here. If we get some offense, we're going to do some real damage."

In 104 games, Peguero's average was .266 with 76 RBIs and 17 doubles. He's had previous Major League experience with Seattle in 2011-13, batting .195 with nine homers in 65 games.

Giavotella, once considered the heir apparent at second base, has been with the Royals in each of the last four seasons, including 10 games this year. In all, he's been in 123 big league games with a .235 average.

This summer for Omaha, Giavotella batted .308 with seven homers, 33 doubles and 61 RBIs.

Pena, son of former Royals manager and current Yankees coach Tony Pena, is in his first season in the Kansas City organization. He banged 27 home runs for Omaha with 61 RBIs and a .240 average in 96 games.

He got into his first big league game earlier this year, catching one inning on May 20.

Coleman was 5-1 with a 2.65 ERA in 35 games for Omaha. He was up briefly with Kansas City this year, pitching in three games. For parts of three years, 2010-12, he pitched for the Chicago Cubs.

Royals host distinguished visitor Dempsey

KANSAS CITY -- The Royals had a distinguished visitor on Sunday, Gen. Martin E. Dempsey, the chairman of the Joint Chiefs of Staff.

Manager Ned Yost revealed the previously undisclosed visit on Monday.

"He wanted to come by and he spoke to the boys," Yost said. "He's a really impressive man. We were honored to have him here. His family came into the locker room and they're huge Royals fans."

Dempsey apparently was in Kansas City on a personal visit.

Crown points

• Outfielder Josh Williingham's aching back was better and he might be ready to fill the designated hitter slot on Tuesday night against the Rangers.

• The club announced the addition of Chris LeLucia, the team's Minor League medical coordinator, as an additional trainer through Sept. 13.

Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.