"Michael is 100 per cent committed to his return, " added Kehm, who is regarded as one of Schumacher's inner circle.

CNN: Schumacher return hit by neck injury

The seven-time world champion is due to replace stricken Ferrari driver Felipe Massa in the European Grand Prix in Valencia later this month, but his spokesperson Sabine Kehm told ZDF television in Germany that the injury could wreck his return.

CNN: Schumacher return hit by neck injury