CHAMPION jockey-elect Tony Cruz must be examined by a doctor before being permitted to ride at tomorrow night's Happy Valley meeting. The Jockey Club instruction follows Wednesday night's midweek meeting where Cruz was replaced on three late rides on the programme after becoming indisposed. It was the third time this season that he has not been able to fulfil his engagements. Cruz, who has never ridden better, was at Sha Tin yesterday morning riding trackwork and prompted a complaint from one trainer to the stipendiary steward on duty, Richard Chew. The complaint centred round Cruz riding work without undergoing a medical despite pulling out of engagements just hours before. Director of Racing, Philip Johnston, said yesterday: ''It is a bit of an embarrassing situation but there is not a lot we can do. ''Cruz reports feeling a certain numbness and does not feel he can do justice to his mounts. ''It is something that is difficult for a doctor to detect so we are going by what he says. ''But he is chasing the title and a lot of winners, so it is scarcely logical that he would pull out of race meetings if he was not feeling unwell or unable to do justice to his rides, as he says,'' added Johnston. But the Director of Racing added that Cruz would be instructed to have a medical before riding at the Saturday night meeting. Cruz confirmed at the Valley that he felt physically unable to do justice to his rides because he felt ''numb and a little weak''. Since splitting with brother Derek he has been chasing rides and making sure that his weight is well down so that he can command mounts at the bottom end of the scale. Cruz confirmed yesterday that he felt fine and was committed to fulfilling his engagements at the interesting Valley night meeting highlighted by the running of the Grand National.