The defender was due to represent his country in a friendly against Luxembourg on Wednesday but his injury will almost certainly see him miss the game.
Walter Smith, the Rangers manager, will be praying that the strain is not too serious as his squad has already been heavy depleted by injuries.
The Scottish Premier League leaders travel to Kilmarnock on Saturday, and their defensive rock admits he is facing a race against time to be fit.
"I'm not sure if I will play. I will have an ultrasound to assess whether or not I'm fit," he told the Daily record.