Ibrahimovic, who signed on a free transfer from LA Galaxy in January, has scored four goals in 10 games altogether competitions since returning to Milan for a second spell.
He sustained a calf injury in training last month but is predicted to recover in time to play some part within the Rossoneri's run-in.
The 38-year-old's contract runs out at the top of the campaign, with Massara revealing no decision has been made on whether he will remain at San Siro for an additional year.
"Ibrahimovic may be a champion," he told Sky Sport Italia. "The team improved an excellent affect his arrival but, come the top of the season, we'd like to take a seat down and discuss things , including his own state of mind.
"He wanted to assist Milan during a difficult time for the club. It goes without saying that any team is improved by having Ibrahimovic in it as he's an outstanding player."
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