Peacock was one of the best pitchers in the Nationals' Minor League system this season. Peacock, who was the Double-A Eastern League's Pitcher of the Year, went a combined 15-3 with a 2.39 ERA for Triple-A Syracuse and Harrisburg. He also struck out 177 batters in 146 2/3 innings.
Peacock will work mainly out of the bullpen. He said he started to feel that he had a chance to play in the big leagues this season.
"When I went to Spring Training, all the coaches started working with me. We all watched video and stuff. I was showing the ball," Peacock said. "This year has been a dream come true. I got to the Futures Game. I never made an All-Star team before that. I started thinking that going to the big leagues could be possible. When I went to Triple-A, I figured I might have a chance to go to the big leagues in September, so here I am."
Lombardozzi may be the leadoff hitter the Nationals are looking for. In 134 games, Lombardozzi hit .309 with eight home runs, 52 RBIs and a .360 on-base percentage.
Johnson planned to give Lombardozzi the next two days to observe before putting him into a game, but the Nationals' skipper had Lombardozzi pinch-hit in the eighth inning Tuesday, an at-bat that resulted in a walk.
Lombardozzi will likely get starts at second base and shortstop.
"I'll let him rest up from a great season, and then I wouldn't hesitate to play him at second base or shortstop," Johnson said.
Lombardozzi said he doesn't pay attention to the praise he has received this year. For him, it's all about playing baseball.
"I just keep going on about my business, just playing the game. To be able to come up here, it's awesome," Lombardozzi said. "I'm here to do whatever it takes for the team -- whatever role it is, I'm in. Whatever it takes to win."
Lombardozzi credits his hitting success this season to people such as teammates Matt Antonelli and Seth Bynum, and hitting coaches Troy Gingrich and Jerry Browne.
"I'm just continuing to learn and just get better on the mental side of the game," Lombardozzi said.