Cassano impressed by new Inter Milan teammate Kovacic
The Italy international believes that it will be money well spent.
"I saw him in the first training session, and you can tell he's got great ability," the 30-year-old told the club's official website.
"Inter have spent big and spent well on him - he's going to be here for the next 10 years.
"He'll become a great player, I'm 100 per cent sure of that."