City fear the defender will miss the start of the season with the damage he suffered on the terrible pitch in Hong Kong used for the Asia Trophy.

Nastasic had scans on his right ankle at the Bridgewater Hospital in Manchester yesterday.

The 20-year-old Serbian star went down clutching his leg after hurting his ankle during City’s 1-0 win over Sunderland on Saturday and was taken off on a stretcher.

But boss Manuel Pellegrini insisted Nastasic’s KO was caused by a kick and not the poor surface.

The Hong Kong Stadium pitch was widely criticised after torrential rain ruined the turf.

Premier League runners-up City kick-off their season against Newcastle on August 19.

And Nastasic will play a key part in their attempts to regain the title after establishing himself as Vincent Kompany’s centre-back partner last season.