Pregame notes: Robertson out, Nelson in

For the second straight day, David Robertson will not be available out of the Yankees bullpen.

"I’m still expecting him Tuesday [in Colorado]," Joe Girardi said.

Robertson has a sore left hamstring, an injury suffered on Wednesday while pitching against the Astros.

Adam Warren pitched three scoreless innings of relief on Friday, meaning the rest of the bullpen should be fresh. But without Robertson and Joba Chamberlain, who went on the disabled list on Thursday, it's a relatively inexperienced group.

NEW FACE: Chris Nelson will make his debut on Saturday, batting sixth and playing third base.

The Yankees acquired Nelson from the Rockies on Wednesday, for cash or a player to be named later. The 27-year-old was batting .242, with no home runs and four RBIS, in 21 games (66 at-bats) for Colorado. Last season he hit .301, with nine home runs and 53 RBIs, in 111 games (345 at-bats).

Jayson Nix had two of the Yankees' six hits on Friday night, but will sit on Saturday. "I want to get [Nelson] in the mix," Girardi said. "That’s why we went and got him."

SATURDAY STEW: Chris Stewart will be back behind the plate on Saturday, despite the fact that it's a day game after a night game. And Girardi plans to play Stewart on Sunday as well.

"I’ll get [Austin] Romine probably back in the mix in Colorado," Girardi said. "I could change my mind. But it’s three days, it’s still early in the year, we had a day off on Thursday and we have a day off on Monday."

Romine has started just one game since being called up last week when Francisco Cervelli went on the disabled list.

"Stewie's always been a guy that can handle a pitching staff, that's the bottom line," Girardi said. "That's what we've asked our catchers to do, to handle our pitching staff well. And he's familiar with these guys. I want Austin to get familiar with them, so we can get him in the mix more, but it takes a little time. Stew's always been a very good defensive catcher."

Stewart's also performed well at the plate thus far this season, batting .270, with 10 hits in 37 at-bats.