WATCH: This is how England star Billy Vunipola broke his arm

The England number eight may be out for a while, after scans confirmed that he had fractured his forearm.

The injury occurred as he swung a flailing arm at Rob McCusker, which connected with the Ospreys number eight's head, sending both players to the turf in a lump.

Despite clutching his arm, Vunipola played on and finished the half, taking part in defense as well as making a drive from a lineout. He even helped big Maro Itoje up from the floor, which couldn't have helped any.

Saracens have since confirmed that an x-ray showed a fracture to the forearm.

"Billy is due to see a specialist later this week, when a timeframe for recovery may be defined."