Lionel Messi will undergo medical tests on Monday after the Argentine was forced off the pitch with a recurrence of a hamstring injury during Barcelona's 2-1 victory over Atletico Madrid.
Messi has struggled with his fitness since a Champions League clash against Paris Saint-Germain last month. And, as his team-mates began to celebrate their La Liga title triumph, the playmaker was taken from the pitch as he felt pain in his right hamstring once again.
"During this Sunday's match against Atletico Madrid, Leo Messi had to abandon the pitch due to issues with the hamstring in his right leg," the club said in a statement. "It was in the 67th minute when the Argentine could no longer continue, thus leaving his team with 10 men - all three substitutes had already been used by Tito Vilanova. This Monday the player will undergo further tests to determine the extent of his injury."
Barcelona boss Tito Vilanova added: "He was bothered in the same area. He felt a strange sensation.
"We've managed this case [Messi's injury] in the best possible way. He was feeling good but the pain can come back immediately, this usually happens with muscle injuries."
Vilanova says until tests confirm the severity of the injury, it is unknown whether Messi will be ruled out for "days or weeks".
Dani Alves and Adriano were also taken off during the match as a precautionary measure, leaving Barcelona to play with 10 men for the final 23 minutes as all three substitutions had already been made.