Milan want the 33-year-old Beckham, who has the right to terminate his Galaxy contract after the 2009 season, back at the Serie A club in January 2010.
"I don't know if he's going to leave after this season whether we would want him back," added Garber.
The former Manchester United and Real Madrid player is believed to have part-funded his move to Milan himself.
Since returning to Europe, Beckham has moved back into contention as a major player for England, who are coached by former Milan coach Fabio Capello.
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