Honda's six-times MotoGP champion Marc Marquez will not race at the Algarve Grand Prix this weekend after suffering a concussion in a training crash, his team said on Tuesday.

Marquez, who won the last two races in Austin and Misano, was preparing for the penultimate round in Portimao with an off-road training session on Saturday when he suffered a fall that caused a slight concussion.

Yamaha's Frenchman Fabio Quartararo sealed the world championship at the Emilia Romagna Grand Prix last month. Marquez is currently sixth in the standings.

Quartararo finds redemption in 2021 after year of disappointment  

"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," Honda said in a statement.

"As a precautionary measure, this coming weekend Marquez will not contest the Algarve Grand Prix."

After Portimao, the 2021 season concludes in Valencia the following week.