Ardiles, who is a close friend of the 25-year-old striker, claims Tevez has been unhappy at Old Trafford ever since Dimitar Berbatov joined the club.
He told ESPN: “Until that day he has been happy in Manchester. But for sure if he doesn’t play, moving to Madrid would delight him.
“Tevez has been playing less since Berbatov arrived. If he’s not played in the starting line-up, then he will have to think twice about his future.
“Because every time he was given the chance to ply his trade, Carlitos played well and scored goals.”