The Italy Under-21 international was substituted at half-time of Sunday´s game against Atletico Madrid after suffering an injury to his right knee, and he underwent an operation on Monday.
Rossi, 20, has scored seven goals in 10 Primera Liga matches for Villarreal since joining the club from Manchester United this summer.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms