Giving no specific reasons, City's executive chairman Garry Cook said that the Brazilian ace will have to explain his sudden exit or else he will be sanctioned by the club.

"I do know Robinho is not at the training centre in Tenerife," Cook told BBC on Tuesday.

"If he has left the training ground it is a breach of club discipline. I am waiting for a full debrief."

Robinho's act adds more woes to the Eastlands club, who were dealt a blow on Monday as they failed to keep their world-record-fee chase to AC Milan's Kaka.