Billy Vunipola will see a specialist this week to determine the extent of the injury he sustained against the Ospreys on Saturday.
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.
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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."
