FC Barcelona are worried about Samuel Umtiti's injury, because it's unusual for a player his age, according to Diario SPORT.
Umtiti has pain in his left knee cartilage, which eventually could become a real problem. This type of pain is said to be rare for people Umtiti's age, 25. As the condition worsens, part of the cartilage can actually fully come lose. This situation caused Carles Puyol to retire.
Umtiti's injury has kept him out of action for long stretches of the season, and, apparently, he's been carrying it since May.
Some within the medical staff feel like he has made a big mistake not getting surgery either before the FIFA World Cup or before the start of the season.