Scotland manager Craig Levein will assess the fitness of several injury doubts before naming his team to face the Czech Republic.
Right-back Alan Hutton has a groin problem, goalkeeper Allan McGregor has been playing through a thigh injury, and Levein also revealed on Wednesday that Steven Whittaker is a doubt.
"On Thursday night, after the training session, I will know for certain who will be 100 % available to play," Levein said. "I will pick the team based on who I think are the best players to win this game. That's my job."
Levein is also likely to monitor the sharpness of Wigan defender Gary Caldwell, who has not played a first-team match since undergoing double hip surgery in the summer.
Levein is definitely without the suspended Lee McCulloch plus injury victims Kirk Broadfoot, Scott Brown, James McFadden, Paul Hartley and Kevin Thomson, and will give his key players every chance to make the Euro 2012 qualifier in Prague.
Levein's selection has been the subject of much speculation with reports claiming the in-form Kenny Miller will be dropped in favour of QPR striker Jamie Mackie, who is in the squad for the first time.
But the Scotland boss claimed the ongoing debate was a "hindrance" to his preparations.
"It's frustrating," he said. "From my point of view, it doesn't help.
"My sole purpose is trying to win a match in Prague and it frustrates me that there are other agendas.
"There is nothing I can do about that - I just concentrate on the football side."
Copyright (c) PA Sport 2009, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms