Atletico Madrid\'s Brazilian midfielder Diego has been ruled out of Thursday\'s UEFA Europa League clash against Serie A club Lazio after suffering a torn right thigh muscle. He left the pitch clutching his thigh during Sunday\'s 1-1 La Liga draw against Sporting Gijon and a subsequent MRI scan confirmed a muscle tear. \"The player is out of the match against Lazio,\" his club said in a statement today without given details of how long he will be away from the pitch. According to sports daily Marca, the playmaker should be absent for a month, meaning he will miss Sunday\'s La Liga clash with Barcelona.