Barcelona could reportedly struggle to sell Samuel Umtiti during this summer's transfer window as many interested clubs are concerned by the centre-back's injury record.
Umtiti joined Barca from Lyon in 2016 and made 83 appearances during his first two seasons at the club.
A knee problem restricted the France international to just 15 outings last term, though, while he has only made 11 La Liga appearances this season due to injury.
The 26-year-old continues to be linked with a move away from Camp Nou, but according to AS, several interested clubs have demanded an 'exhaustive medical examination' of the centre-back's troublesome knee before committing to a deal.
The report claims that the cartilage issue forces Umtiti to have synovial fluid drained from the area every month, which is a concern for potential buyers.