Marotta also said that there had been enquiries from other sides, but that no decision had yet been made on the player's future.
"There is interest from Inter, but we will see what to do in the next few weeks," Marotta told Sky Sports News.
"There isn't only Inter, we have had several requests for him. We haven't made a decision yet. He is a good guy who suffered a bad injury."
Isla is co-owned by Udinese, which means any deal must be agreed with Zebrette too.