Massara was speaking before Ibrahimovic's brace in victory over Sampdoria yesterday.
“We are talking to Mino Raiola and trying to do it behind the scenes, even if it's difficult to keep anything from the media nowadays," confirmed Massara to Sky Sport Italia when asked if Ibrahimovic will remain.
“There are issues that we will evaluate together, including Ibra's spirit and desire to continue this wonderful adventure, which has been so positive in the second half of the season.
“We are all happy, first and foremost Ibra, that he's been able to prove his value to Milan all over again."
Donnarumma is also represented by agent Raiola, but Massara his situaton is different.
“That is a different situation, but we are eager and confident that we can resolve both of them positively. Donnarumma has a contract and we'd like a longer one to create a stronger future together.
“Ibra, on the other hand, is out of contract this summer and so these are very different discussions."