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The Catalan giants led twice against Levante on Tuesday evening but were pegged back to draw 3-3.
It leaves them on 76 points with two games to spare - while rivals Atletico Madrid and Real Madrid have a game in hand while a point ahead and behind respectively.
One man who will be left most devastated about the result is Messi, who has carried his side throughout this season.
He opened the scoring to register his 29th La Liga goal this campaign but couldn't inspire his side to victory.
Last summer saw the six-time Ballon d'Or winner play a part in one of football's most controversial transfer sagas.
Fans have reacted to their season and believe Messi could've been enjoyed trophies had he been allowed to move to England.
Victory for Ronald Koeman's side would've taken them top and Messi's volley got them going inside 25 minutes.
Teenage sensation Pedri added a second not long after before Levante roared back with goals from Gonzalo Melero and Jose Luis Morales.
Ousmane Dembele put Barca ahead once again before Sergio Leon's late equaliser denied all three points.
"We were good in the first half, with good rhythm and intensity, and led on the scoreboard," Koeman told Marca. "But in the second half we lost a lot of dangerous balls, we lowered our intensity. We made a lot of mistakes in defence and we weren't attentive.
"At 2-2, we reacted and scored, but then it was easy for them to score again. [Conceding] three goals in 45 minutes is not Barcelona's level.
The Dutchman addressed his future as manager and responded: "Coaches are always questioned.
"But I understand that after the second half there will be questions. We're disappointed and we wonder what happened in the second half. We have to move on and we have to prepare for next season."