Livorno keeper Amelia: I heard Ronaldo's knee snap
"I heard a horrible noise," the Azzurri custodian said. "I have never heard anything like it and then I heard Ronaldo yell.
"We all feel very close to him because he is such a great player who has battled back from such problems in the past and now he must fight another injury.
"I want to offer him all my best wishes and that goes for all the other Livorno players as well."