How will the three call-ups fit into the mix?

Xavier Nady had six RBIs in 40 games with the Nationals this season. He already has three RBIs in his first game since getting called up by the Giants. The veteran outfielder, who signed a minor league deal with the Giants after getting his outright release by the Nationals, has made an early impact with his new team. Who knows, the guy might end up getting playoff shares from two separate teams in the same season. The Nationals clubhouse got a little more crowded today, as John Lannan, Sandy Leon and Eury Perez were recalled from Triple-A Syracuse and Mark DeRosa was activated off the disabled list. DeRosa celebrated his return by taking the microphone of the clubhouse karaoke machine and introducing various reporters that walked in, rattling off funny information he found on the Internet or Twitter. The routine was a big hit, among players and reporters alike. So how will Davey Johnson utilize the new pieces on his active roster? Well, none of the guys will likely get much playing time for now, at least until Lannan slides into the starting rotation when Stephen Strasburg is shut down. Lannan will throw a side session tomorrow, Johnson said, meaning he won't be used in relief for at least the next few days. Leon will serve as the third catcher, allowing Johnson to use one of the catchers on his bench as a pinch-hitter. With just two catchers on the roster, Johnson is hesitant to use that day's backup as a pinch-hitter because it leaves him vulnerable if the starting backstop gets injured. Johnson joked that the speedy Perez will take over the Edwin Jackson role of a late-inning pinch-runner, although the Nationals' skipper doesn't often bring in a guy late in a game to try and swipe a bag. "I'm not big on trying to steal a base," Johnson said. "I don't care how good you are, you could still get thrown out. But it's nice to have that option." Because Perez is right-handed, he gives Johnson a compliment to Bryce Harper and Roger Bernadina in center field - two left-handed guys. Often, teams that are out of playoff contention call up a handful of prospects once rosters expand on Sept. 1, allowing the minor leaguers to get a chance to showcase their talent and get a taste of the big leagues. That's what the Nats have done in past seasons, including last, when Johnson was able to see Brad Peacock, Tommy Milone and Steve Lombardozzi in action at the big league level. That plan changes when you're in contention, though. The Nats didn't want to crowd their clubhouse and disrupt chemistry, and there's no point in bringing up 10 players if they're just going to sit around and not get a chance to play. "We have what we need here without any reinforcements," Johnson said. "I'll get (the three call-ups) in games, but I'm not worried about them getting in games and getting playing time. "Every game, I'm putting my best foot forward. We're no longer developing, in case you haven't noticed." Johnson also announced that Triple-A Syracuse manager Tony Beasley, pitching coach Greg Booker and hitting coach Troy Gingrich will join the Nats once their season ends. Teams often add minor league managers and coaches in September to give them a look at how the day-to-day operation works at the major league level.