On 2 April 2013, after scoring a goal in a match against Paris
Saint-Germain, Messi suffered from a hamstring problem in his left leg
and was substituted at half time. Since then his first team appearances
have been irregular. On 13 May 2013, Messi was unable to finish the
match against Atletico Madrid due to recurrence of the hamstring injury
in his left leg, he was forced to leave the field midway through the
second half. It was later announced that he could miss the rest of the
season due to the injury. In the second leg of the Champions League
Quarter final against Paris Saint-Germain, Barcelona were down a goal,
and Messi was on the bench due to a recurring injury problem.
