Rookie outfielder Brett Jackson, who bruised his right knee crashing into the wall on Friday, was moving much better on Sunday but is not expected back in the Cubs' lineup until Tuesday at the earliest.
The Cubs face left-handed pitchers on Sunday and Monday, and Jackson would not start against them normally. Cubs manager Dale Sveum said the club would reevaluate Jackson on Tuesday.
Dave Bialas, who had been in the Cubs' organization for 18 seasons, was dismissed on Saturday. He was Triple-A Iowa's manager this season.
"He always gave me good advice, and motivation to get you through the year," said outfielder Dave Sappelt, who played at Iowa this year. "I thought he was good."
There has been an effort to get Adam Greenberg another at-bat. The former Cubs outfielder's season ended after he was hit in the head in his only big league at-bat in 2005.
"That was obviously one of the more unfortunate things to happen in baseball," Sveum said. "The kid's only at-bat, and for that to happen, it was awful to think we spend our whole life to want to play in the big leagues and you get there and something like that happens. It's unfortunate."
The Cubs have no plans to add Greenberg to the roster.