Joe Girardi says that Hideki Matsui will not play the outfield until June this season, according to the Associated Press.

"The earliest we would need him in the outfield would be interleague, and that's a ways off," Girardi said Wednesday. "That's why we envision him as our everyday DH. We need him. He's a great RBI guy. He's very important to our lineup."

I can't totally agree with Girardi's first point.  This means that we cannot give other players "half-days off."  For example, we will probably need to give guys like Jorge Posada and Johnny Damon days off in the field, but we won't be able to DH them because of Matsui.  
Matsui's legs are a major concern for me and I think it should be for the Yankees too.  He is normally a good offensive weapon, but he is becoming a liability on defense.  
His contract expires after this season, and I don't see the need to re-sign him.  The Yankees have too many outfielders as it is, and there will be a huge market for outfielders for next season.