Ronald Koeman admits Barcelona may face crippling difficulties in front of goal if Lionel Messi decides to leave this summer.
Messi, 33, scored his 30th La Liga goal of the season - his 38th in all competitions - in what may have been his final Camp Nou game on Sunday night.
The Argentine opened the scoring in the first half against Celta Vigo only for Santi Mina's double to fire the visitors to victory, ending Barcelona's faint hopes of the title.
Antoine Griezmann (12) is the only other Barca player in double figures for league goals and Koeman confesses Messi's attacking output is irreplaceable. "He has scored 30 goals in La Liga and has given us many points in La Liga," said the Barcelona boss. "It's a question for Leo.
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