Wales have a fresh second-row worry as the 2021 Six Nations tournament looms.
Will Rowlands failed a head injury assessment as Wasps won 52-44 at Bath in the English Premiership on Friday.
Ospreys boss Toby Booth says Wales captain and world-record cap holder Alun Wyn Jones is "winning his battle" to be fit for their opener against Ireland on 7 February.
Like Jones, Scarlets' Jake Ball is a concern for Wales boss Wayne Pivac as he recovers from a knee injury.
Rowlands left the fray at The Rec shortly before half-time.