Scotland captain Sione Tuipulotu's participation in the Six Nations has been cast into doubt after he was injured in training with Glasgow Warriors.
The centre sustained an upper body problem this week, though he was going to be rested for Warriors' Champions Cup game with Harlequins on Saturday anyway.
Tuipulotu is being assessed and Scotland head coach Gregor Townsend faces a nervous wait to see if one of his most influential players will miss part, or even all, of the Six Nations campaign.
It would be a huge blow to lose a man considered one of the form players in Europe right now and viewed by many as an obvious choice for the British & Irish Lions tour to Australia this summer.
Tuipulotu made his Scotland debut against Tonga in 2021 and has scored three tries in 30 international appearances.
Scotland's opening match of the tournament is against Italy at Murrayfield on February 1.