Scotland captain Darren Fletcher has flown out to join the squad for Saturday's Euro 2012 qualifier with Liechtenstein.
Fletcher was expected to miss Saturday's game after not travelling out with the rest of the party on Thursday due to tonsillitis.
However, the Manchester United midfielder has made a quicker than expected recovery and is now in contention to face the Group I minnows.
"Darren will arrive today and I have not 100 per cent ruled him out of tomorrow," said Scotland boss Craig Levein.
"He feels better.
"He will do something on his own today.
"I have to wait to see him and assess him. If the medical team gives him the thumbs up he will play, if not he is 100 per cent certain to be involved on Tuesday (against Spain)."
Levein is also hopeful Kenny Miller will be fit to play after recovering from a groin problem, but he will not take any risks with the striker with next week's clash with Spain in mind.
"Kenny is doing a little bit of training this morning and will hopefully get through that and train with the rest of the boys later," added Levein.
"But I won't take any silly risks. If he is fit he is fit, if he is not then he will not play.
"I am relaxed about it. I have spoken to Malky Mackay (Cardiff manager) about it and we are both on the same page and I have said to him as well that I am not in the business of risking players who have injuries.
"It doesn't do me, Kenny or the club any good.
"But I am hopeful with Kenny because there has been a big improvement this week. I just want to be sure.
"I will until tomorrow before naming the team in all likelihood because I just want to see if he has any reaction to what he does today.
"Kenny is an important player for us and he knows he is an important player and I would like to have him available but we will see what the outcome is today."
The news is a major boost for Levein's men as nothing more than victory in Vaduz will do if Scotland are to keep alive their hopes of qualifying for Euro 2012.