Colvin made his first start on Thursday and delivered with his first Major League home run in the Cubs' 2-0 win over the Atlanta Braves. Xavier Nady, slowed this spring while he rehabbed from his second Tommy John surgery, made his first start on Friday in right field.
Piniella has to try to get enough at-bats for Alfonso Soriano, Marlon Byrd and Kosuke Fukudome, as well as Nady and Colvin.
"Once we get a few of these guys at-bats, we'll probably just play Nady against left-hand pitchers, as soon as we start playing left-handers," Piniella said. "Then we can get Colvin in there from time to time.
"Look, it's not the easiest thing in the world to do," Piniella said. "We're doing the best we can."
Piniella has said he has to get Colvin at-bats if he's going to keep the outfielder on the roster. The Cubs' 2006 No. 1 Draft pick ranked third in the Major Leagues in batting average this spring with a .468 average.
"Invariably what will happen is the guys who are doing the best are the guys who will get the bulk of the playing time," Piniella said. "That's the way it was when I played, and that's the way it is still. We'll get everybody in there and get them some at-bats and go from there."