- 5 updates
In a press conference in Glasgow, Wales captain Ashley Williams said Gareth Bale has had a virus, and missed training over the last few days.
He predicted "all being well, he should be playing."
Gareth Bale is with the Wales squad in Scotland, and is "fine" to play in tomorrow night's game, a spokesperson for the Football Association of Wales told ITV News.
It was thought Bale had not travelled to Glasgow with the rest of the party.
He has been struggling with an ankle injury he picked up playing for his club side Tottenham.
Gareth Bale has not arrived with the rest of the Wales squad in Scotland, ahead of their World Cup qualifier tomorrow night.
The Spurs winger - who scored both goals as Wales won 2-1 when the two sides met in Cardiff - has been struggling with an ankle injury and missed training again yesterday.
Midfielder David Vaughan has been ruled out Wales' game with Scotland, the latest injury setback to Chris Coleman's squad.
Vaughan will miss Friday's match, but be back in time for their next World Cup qualifier, against Croatia, on Tuesday.
Liverpool midfielder Joe Allen and Leeds striker Steve Morison are already on the injury list.
Gareth Bale has yet to train with the team after picking up an ankle knock on club duty, but the FAW insist he is fit to face Scotland.
Wales' most-capped player, Neville Southall, says Chris Coleman could be sacked as the national side's manager if his side lose to Scotland in their World Cup qualifier on Friday night.
"It is a massive game for both countries, probably more so for us. Strachan will be given another chance if we lose, but I think with ours it could nail the coffin for the manager, for us financially, and for the fans."
"Personally, I wouldn't sack him but if we lose this one there will be an awful lot of people queuing up to put a knife in his back."
Gareth Bale inspired Wales to a 2-1 win over Scotland, when the two sides met in Cardiff in October, but Wales are still a long way off the pace in Group A, and Coleman under pressure.