Wales star Liam Williams faces a race against time to be fit to feature at the Six Nations.
Williams, who can play at wing or full-back, had surgery on a metatarsal injury that hindered his Rugby World Cup preparations.
He recovered to play a part in the tournament, but re-injured his foot in a Pool A encounter against Australia.
Scarlets expect him back around the time the Six Nations begin in February, but coach Wayne Pivac is unsure if Williams will be available for international consideration.
"Liam is going to be touch and go in terms of availability for us around the timing of the Six Nations," Pivac said after Scarlets' 27-26 Pro12 defeat to Ospreys.
"That is going to be a medical call at the time. He is pain free so that's a good sign.
"We are not going to rush him back because it's the second time around for that foot.
"It's really important we get it right otherwise he could be out for a considerable time if we bring him back early."