MILWAUKEE -- In a clubhouse for the first time as a Major League Baseball player, Trevor Rosenthal had a difficult time hiding his smile on Monday at Miller Park.
Called up from Double-A Springfield to bolster the Cardinals' bullpen, Rosenthal said he's been smiling since he received the news from Springfield manager Mike Shildt and pitching coach Bryan Eversgerd. He also said that was a discussion he'll never forget.
"It turned out to be one of the best conversations I've had with a coaching staff in my career so far," Rosenthal said. "It was really special and there were a lot of emotions in there. I'm definitely happy to be here right now."
To make room for Rosenthal on the 25- and 40-man rosters, St. Louis optioned reliever Maikel Cleto to Triple-A Memphis and transferred left-hander Jamie Garcia to the 60-day disabled list.
The 22-year-old right-hander had spent all of this season in the Springfield rotation, going 8-6 with a 2.78 ERA in 17 starts. His last outing came on Thursday, when he allowed four hits in six shutout innings.
Spending most of his time in the Minor Leagues as a starter, Rosenthal said he doesn't expect there to be too much of an adjustment period moving to the bullpen.
"It will be a little bit different," he said. "But I did a little of that in Spring Training, and in past years I've come out of the bullpen through the system. It's just pitching and getting outs."
Spring Training is when Rosenthal impressed many people in the organization, including manager Mike Matheny. Appearing in five games, Rosenthal allowed five hits and one earned run in seven innings. Since then, Matheny said there have been talks about seeing what he can do in the Majors.
"We put him in some positions with some intensity just to kind of see how he would handle it," Matheny said. "He came out and made good pitches. He's continued to take advantage of the opportunities we give him, and that makes an impression."
For Rosenthal, who was available right away Monday night, he said the time spent with the Cardinals during Spring Training also helped him build relationships with most of the players and coaches. And although he never expected to be in the Majors this season -- skipping Triple-A altogether -- Rosenthal said he's ready to go.
"Throughout the season I've just been trying to keep my nose to the grind and work hard," he said. "I didn't really expect anything of this caliber, but I'm definitely happy to be here. I feel really blessed to have the opportunity."
Jenifer Langosch is a reporter for MLB.com. Read her blog, By Gosh, It's Langosch, and follow her on Twitter @LangoschMLB. This story was not subject to the approval of Major League Baseball or its clubs.