Barcelona star Lionel Messi could miss the rest of the season after he appeared to suffer a recurrence of a hamstring injury during Sunday's 2-1 victory away at Atletico Madrid.
The 25-year-old will undergo tests on Monday to determine the extent of his injury, with unofficial reports in Spain claiming the Argentina captain has suffered a thigh muscle tear.
Messi, who has scored 46 La Liga goals this season, watched from the dugout as his team-mates came from behind to beat Atletico at the Vicente Calderon - keeping alive their hopes of securing 100 league points in yet another title-winning campaign.
Atletico's Radamel Falcao opened the scoring early in the second half, but Alexis Sanchez levelled the scores before Gabi put the ball into his own net as Barcelona secured another three points.
"He was bothered in the same area. He felt a strange sensation," said Barcelona boss Tito Vilanova of Messi after the final whistle.
Vilanova added that Monday's tests will reveal whether he will be out for "days or weeks".
The Catalan giants, who were crowned champions of Spain for the fourth time in five years on Saturday after Real Madrid failed to beat Espanyol, host Real Valladolid this weekend before making the short trip to Espanyol later this month.
The club's final game will be against Malaga at the start of June.
Messi has once again been Barcelona's most important player this season, scoring a remarkable 60 goals in 50 appearances in all competitions.
However, it now looks certain that the world-class forward will be unable to beat last season's record-breaking tally of 73 goals in 60 games.
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