World champion Marvin Musquin suffered a knee injury at Bercy last weekend.

Current MX2 Motocross World Champion Marvin Musquin’s AMA Supercross debut is in jeopardy after suffering an injured knee at the Bercy Supercross in Paris last weekend.

Paris Bercy Supercross should have been a highlight for Red Bull KTM’s factory rider Musquin and his many French fans, however he’s now fighting injury before his all-important switch to the United States for 2011.

Musquin had to retire from the challenging event during Saturday’s racing when he put his leg down hard in the heat of the battle and injured his right knee.

Marvin’s doctors in France are currently assessing the injury and more will be known when the swelling goes down and he is able to undergo an MRI scan, which scheduled for some time at the end of the week.

Meanwhile, Musquin is recovering at home in France and more should be known about the extent of the injury after the scan.

Musquin is scheduled to make his AMA Supercross debut in the West Coast Lites regional series at the beginning of January.

According to Racer X, sources in France are reporting that Musquin tore his ACL in the incident and will likely require surgery that could force him out for up to six months.