Real Madrid may have 'committed an error' in signing Gareth Bale for a world record fee of £86million from Spurs according to a leading Spanish doctor.

While Real deny the Wales international needs surgery for a back problem the club admitted Bale 'has a small chronic disc protrusion which is extremely common among football players and that does not in any case [affect them in] the normal course of their duties.'

Injuries have restricted Bale who had no pre-season action while he was with Spurs to 132 minutes at Real - 106 in La Liga and 26 in the Champions League scoring one goal.

Dr Avelino Parajon told MARCA: 'If Real Madrid have signed Gareth Bale knowing about this protrusion they have committed an error.

'That is not to say that tomorrow it can be operated on and he can continue playing like has happened many times.

'But if he already has problems with protruding discs that indicates that it is not a one-off.

'When a person has those problems at that age it suggests that he has a great possibility of suffering herniated discs and symptoms arising from that over time. It is a bad sign for any athlete.'

Coach Carlo Ancelotti believes the forward will be available for the game against Malaga this weekend and more importantly against Barcelona in El Clasico on October 26.

Real’s medical team are concerned about the problems playing two games a week might cause and that surgery could see Bale sidelined for up to four months.