Wales face an anxious wait on the fitness of centre Gavin Henson ahead of their Six Nations opener at Murrayfield.
The Ospreys star - who has not played for his country since the last Six Nations due to injury - has a calf problem.
The 27-year-old suffered a tightening of a calf muscle in training on Tuesday. He did not train on Wednesday, while Thursday is a scheduled day off for the squad.
Henson has missed Wales' last six Tests, initially because of an ankle injury and then a long-standing Achilles' tendon problem he aggravated before the autumn series opener against South Africa.
Head coach Warren Gatland had hoped to field Henson and 6ft 4ins Cardiff Blues centre Jamie Roberts for the Springboks match in early November, but Henson withdrew 24 hours before kick-off.
Now Gatland is concerned that his new-look midfield combination could be broken up again before making a tackle in anger.
"Gavin just felt his calf tightening in training," said Gatland. "He will have some treatment, there is a day off tomorrow, and when he comes in on Friday we will make a decision.
"We are not going to wait like we did in the autumn until the day of the match. It's only fair, in the first game, we make the call on Friday.
"If Gavin is not right, Tom (Shanklin) will come in and probably go to 13, Jamie move to 12 and Andrew Bishop brought in as bench cover.
"There is no point training on it and making it a major problem that would keep him out for six or eight weeks.
"We are being precautionary at the moment, but if it is still tight on Friday and it's not right, we will pull him."