AC Milan suffered a huge blow as midfielder Gennaro Gattuso has been hit by a thigh strain. The World Cup winner will be sidelined for three weeks and won't be available when the Rosonneri will take on Fiorentina next Sunday but above all Arsenal clash at the Emirates in the UEFA Champions League on Friday 20. It had originally been reported that Gattuso would be back after 50 days but later on Milan announced that he will return to action in three weeks. The 30-year old midfielder is a key player in Carlo Ancelotti's squad and his absence will deeply harm the World Champions.