Zambrano is a free agent after his contract with the Marlins expired.
• The Cubs have had two games rained out this year and, when they do play, their pregame workouts have been limited by chilly and sometimes wet conditions.
"This has probably been a little exceptional as far as not being able to get on the field, and when we get on the field, it's been pretty miserable work conditions, too," Sveum said. "But that's what it is. Guys get plenty of swings in, but the concerning part is the work on the defense and those kind of things. But that's part of the game. It's a long season, we've just come out of spring. But the bottom line is we're just not getting on the field and getting any kind of quality work."
• Matt Garza is on track to make his first rehab start on Friday with Class A Kane County, pending the weather.
Garza, coming back from a strained left lat suffered during a live batting practice session Feb. 17 in Spring Training, is expected to throw just two innings. He has four starts scheduled, but Sveum said the final number will come down to how many innings and pitches he throws and how Garza feels.
• Cubs first baseman Anthony Rizzo stopped by the Ann & Robert H. Lurie Children's Hospital of Chicago Tuesday to visit with patients and their families. He presented Cubs hats and notebooks to the kids. Rizzo is a cancer survivor himself.
Joey Nowak is a reporter for MLB.com. Follow him on Twitter at @joeynowak. This story was not subject to the approval of Major League Baseball or its clubs.