The midfielder is in talks with West Ham United.
"Milan could've dealt with the situation better after 18 years together," agent Moreno Roggi told Radioblu.
"He always declined all offers, was impeccably behaved on the field and off, so I hope Milan will give him a worthy send-off.
"Massimo did expect this decision, but he was still a bit upset. At this moment, seeing as he feels in good shape physically, we will evaluate offers.
"The situation is we turned down an offer from Los Angeles. We have negotiations going on with West Ham, but nothing with Fiorentina, as they have not made us any proposals. Having said that, I do hear Ambrosini is on the list for the Viola if David Pizarro leaves.
"We received another offer this morning from Australia."