Alejandro Balde was forced off for Barcelona in Monday night's 1-1 draw with Granada.
Called on to be Jordi Alba's replacement in the 1-1 draw with Granada, the youngster went off injured, suffering a back problem.
The 18 year old was feeling his back after half an hour, with the change in the 42nd minute jeered by fans angry at coach Ronald Koeman, not realising Balde was injured.
Barcelona put out a medical statement in the second half saying he will have tests to find out what is causing the issues.
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