RepsolCaixa Moto2 star Marc Marquez's participation in the final race of the year at Valencia next weekend is in doubt after the Spaniard was suffering from double vision as a result of his free practice crash at Sepang necessitated a visit to hospital in Barcelona.

He was discharged from the Institut Universitari Dexeus this morning after a two-day stay after s did an exhaustive examination and different tests, keeping him under observation and under medical treatment. A decision on whether he will attend the Valencia MotoGP round will be taken in the next couple of days.

Dr Xavier Mir, head of hand surgery, said: "Marc has a left shoulder traumatism, and incisive wound on the chin and second degree burns on the right knee, so we started with the cures to start regenerating the skin."

Colleague Dr. Ángel Charte diagnosed the double vision problem, saying: "In Malaysia he also suffered an episode of blurred vision and image distortion. We did several diagnosis tests that showed that he suffers periorbital edema that produces a sequential vertical diplopia (double vision), and discards any other type of injury. He is following a treatment to correct this vision alteration and it is evolving satisfactorily."