The 21-year-old was hurt as he fell awkwardly when delivering a cross during the first half of Thursday's Copa del Rey second-leg tie at Getafe.
Neymar was clearly in pain and unable to put weight on his injured leg as he was helped from the field by medical staff.
Camp Nou officials confirmed afterwards that he had suffered a sprained the peroneal tendon in his right ankle.
The injury could keep him out of Barcelona's UEFA Champions League knockout clash with Manchester City - the first leg of which is at the Etihad Stadium on February 18.
‘He instantly popped into our ratings as one of the best U21 midfielders in Europe. The impressive thing is Slot has made him into more of a no.6' Inside Ryan Gravenberch's transformation at Liverpool
‘I don’t think Liverpool would look at Ollie Watkins, a striker isn’t a pressing issue for them – it’s Arsenal who need one’ Former Reds star explains why his old club don’t need an out-and-out forward this summer
