Scotland boss Craig Levein has called St Mirren goalkeeper Craig Samson into his squad for the World Cup qualifier with Macedonia at Hampden Park on Tuesday.
Levein admitted he had slight concerns over the fitness of No.1 Allan McGregor and deputy Matt Gilks, while midfielder Charlie Adam is also being monitored.
Scotland began their Group A campaign with a goalless draw at home to Serbia on Saturday, where McGregor's groin injury, which he suffered in the friendly win over Australia last month, resurfaced.
Speaking at Scotland's Mar Hall training base, manager Levein assessed his three injury doubts and confirmed St Mirren's Samson had joined up with the squad.
He said: "Charlie Adam has a wee problem, Matt Gilks picked up a problem in training (on Sunday) and Allan McGregor has the same thing but nowhere near as bad as he was.
"I am hopeful that all three will make it."
Asked if the Besiktas goalkeeper would require an injection to play, Levein said: "I don't think so and I don't think it is something that we would do, that's more for his club to undertake.
"He is an experienced player and he will know better than anybody if he is fit to play.
"But I spoke to him and Matt and they are fairly positive and so is Charlie. Craig Samson joined us, he is in to train, and we will see what happens."