George North, Dan Baker and Rhys Webb all had injury scares after a potentially damaging day for Wales before the autumn internationals.
Forward Baker was carried off on a stretcher in the Ospreys’ 26-21 defeat by Clermont on Sunday with Rhys Webb also leaving the game hurt.
Winger North suffered a knee injury as Northampton lost 57-13 to Saracens.
Wales coach Warren Gatland is due to name his squad for the four autumn Tests on 24 October.
His side face Australia on 11 November, Georgia on 18 November, New Zealand on 25 November and South Africa on 2 December.
North will have a scan on Monday after the Northampton player was forced off the field at Franklin’s Gardens.
Ospreys coach Steve Tandy said: “Baker had a bad one. We will have to wait 24 to 48 hours until we will know more.”
However, he acknowledged the replacement of scrum-half Webb was more precautionary.
“I think Rhys was just cramping up. He’s been banged up after not playing too much recently so it was probably just fatigue,” he said. “Hopefully it’s not too serious.”