MotoGP rookie Karel Abraham has withdrawn from Sunday's Japanese Grand Prix at Motegi.

The Cardion AB Ducati rider required hospital checks after being hit on the helmet by his bike at Aragon on September 18 and has had 'problems with concentration' throughout this weekend.

"It would be a risk to start the race in such a conditions," said the 21-year-old. "I'm sorry I'm not able to participate in the race, but I believe it's the right decision not to risk anything."

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Abraham had qualified 15th and was 16th and last of the full time riders in morning warm-up.