Manchester City’s Aymeric Laporte has flown to Barcelona for scans on his knee injury.
City expect to discover the extent of the damage on Tuesday after Dr Ramon Cugat assessed the central defender.
Manager Pep Guardiola will be hoping John Stones can return after the international break after missing two games with a thigh strain.
The Frenchman was carried off on a stretcher after going down in agony following a challenge on Adam Webster late in the first half of Saturday’s win over Brighton.
The club have already lost winger Leroy Sane to a long-term knee problem this season and the club are anxious Laporte has not suffered the same fate.
Guardiola, who described Laporte as the world’s best left-sided centre-back only on Friday, said following the game: ‘I think he is in hospital. It doesn’t look good but I don’t know exactly what he has done.
‘He didn’t feel good. I think, for a while, he will be out. Hopefully it is not as long as Leroy but we will see.’
With John Stones still sidelined, Laporte’s exit also forced midfielder Fernandinho into emergency action as a centre back, highlighting City’s shortcomings in the area after Vincent Kompany’s departure.