The former Sampdoria striker has joined Milan overweight.
"I found him to be in good shape, although he needed a diet," grinned Ibra. "Cassano is a professional and I doubt we'll get into arguments. We are all working in the same direction.
"A lot depends on what he wants. Cassano couldn't have got into a better situation than this, so if he doesn't want to make the most of it, then he'd make life difficult for himself."