Source: Dermot Corrigan, ESPN 
Lionel Messi has likely played his last game of 2013 after tests carried out on Monday found that the Barcelona forward tore a muscle in his left thigh during the previous night’s 4-1 Primera Division win at Real Betis.
Messi, 26, appeared to suffer an injury during a sprint while challenging for the ball with Betis defender Jose Caro in the 18th minute. The four-time Ballon d’Or winner immediately approached the Barca dugout to tell them he was hurt, and Andres Iniesta replaced him in the 21st minute.
At the time it looked like the Argentina captain had suffered another muscle problem, and confirmation of a tear came via a club statement released on Monday.