The DHL Stormers are sweating on the fitness of Evan Roos as they prepare for a gruelling December schedule that includes their Champions Cup debut.

The powerful and dynamic three-Test Bok loose forward suffered a rib injury in the impressive win against England at Twickenham on Saturday.

STATE OF THE URC: Sharks spoil near-perfect SA weekend

The 22-year-old earned his third Test cap on Saturday after impressive performances in the Vodacom United Rugby Championship, playing an integral part in helping the Cape Town side lift the inaugural championship.

Roos suffered the injury in the fifth minute of the match but played on until he was substituted at the start of the fourth quarter.

Though the severity of the rib injury has yet to be determined, Stormers coach John Dobson’s plans for a tough upcoming schedule would have been based on a hefty contribution from Roos.

MORE: Bok wing in line for comeback

Coming off a bonus-point win against Scarlets, the defending champions travel to face the Dragons at Nelson Mandela Bay Stadium on Saturday.

A busy December calendar sees the Stormers make their Champions Cup bow in France against Clermont before returning to host Premiership outfit London Irish, and this is followed by heavyweight derbies against the Vodacom Bulls and Emirates Lions in the Vodacom United Rugby Championship at Cape Town Stadium.

Photo: Ashley Vlotman/Gallo Images