Cubs general manager Jim Hendry told the Chicago Tribune that he found Zambrano's actions "intolerable." Although Hendry said he hasn't talked to Zambrano, he did talk to his agent who told him Zambrano was "not in the retirement mode."
During the 30 days, the team and the Players' Association will discuss Zambrano's situation.
That means he would rather not give up the more than $20 million owed to him by the club. Zambrano had reportedly told people he was going to retire after he was ejected from Friday's game for throwing at Chipper Jones and then packing his bags and leaving before the end of the game.
Hendry said he apologized to Braves general manager Frank Wren for spoiling the night dedicated to honoring former Braves manager Bobby Cox.
The team could call up Triple-A starter Casey Coleman to take Zambrano's place in the rotation.For more baseball news, rumors and analysis, follow @eyeonbaseball on Twitter or subscribe to the RSS feed.