Former MotoGP king Marc Marquez has ruled himself out of this weekend's Portimao race after sustaining a concussion.

The Repsol Honda man was training off-road when he crashed and banged his head.

A team statement reads:

This past Saturday Marc Marquez, while preparing for the Algarve Grand Prix with one of his standard off-road training sessions, suffered a fall that caused a slight head concussion.

After a few days of rest at home and seeing that he was still unwell, today Marquez has been assessed by doctors in a medical check-up to evaluate his current status. As a precautionary measure, this coming weekend Marquez will not contest the Algarve Grand Prix.