Scotland manager Craig Levein has major defensive concerns ahead of Tuesday's Euro 2012 qualifying game against Liechtenstein at Hampden Park.
Levein admits to running out of options at left-back to such an extent that he has placed Jay McEveley on standby.
Steven Fletcher is a already a doubt while Chris Iwelumo (hamstring) and goalkeeper David Marshall (elbow) are concerns, but the problems in defence are giving Levein a major headache.
Lee Wallace (foot) and Kevin McNaughton (ankle) joined up with the squad after missing the draw in Lithuania.
Kirk Broadfoot has returned to Rangers following an ankle knock while Steven Whittaker is still being assessed after struggling with a calf knock he picked up during Friday's goalless draw in Lithuania.
"There are one or two that are still being looked at and assessed and I will have a clearer picture of who will be available tomorrow," Levein told Sky Sports News.
"I have a real concern over Whittaker. He took a knock to his calf and came off the pitch with five or ten minutes to go on Friday.
"It's touch and go for tomorrow, but I'd like to have him in the team.
"Lee Wallace will do some training today while Kevin McNaughton did some training yesterday, so you can see a pattern developing about the three players I have spoken about.
"They are all capable of playing in the left-back position, so that's obviously a concern for me.
"Kirk Broadfoot turned his ankle yesterday, so he's had to go back to his club. Luckily, it's nothing too serious, but it will keep him out of the game.
"Jay will come into contention but I want to give Whittaker the opportunity to play."
The former Dundee United boss revealed that he will ring the changes for the game against the 141st ranked team in the world, with James McFadden, Kris Boyd and Graham Dorrans all likely to return to the starting line-up.