Scott Brown and James Forrest are struggling to be fit for Celtic's Champions League meeting with Barcelona after the midfielders pulled out of the Scotland squad through injury.
Scotland have now won only 27% of their competitive matches under Craig Levein, the worst winning statistics for a permanent Scotland boss for 58 years coming in the wake of Friday's 2-1 defeat by Wales.
Norwegian Tom Hagen will referee Scotland's match in Belgium on Tuesday having been in charge matches involving Craig Levein's side twice previously - both victories, at home to Australia and away to Liechtenstein.
Two Scottish referees will be in World Cup action on Tuesday, with Willie Collum in charge as Slovakia host Greece and Craig Thomson being the man in the middle as the Netherlands visit Romania.
Scotland pair Gary Caldwell and Charlie Adam are one yellow card away from being banned for the World Cup qualifying visit by Wales in March.
Former Rangers midfielder John Fleck has been given the all-clear following fears that he fractured his skull after being stretchered off in the 70th minute of Coventry City's 2-2 draw with Swindon Town.
Former Scotland striker David Goodwillie's loan deal with Crystal Palace is to be scrapped after the 23-year-old struggled for fitness and form and made only one appearance with Blackburn Rovers' Championship rivals.
Scottish driver Ryan Dalziel capped his best-ever year in motor racing by winning the inaugural FIA World Endurance LMP2 class title in Japan, adding to class wins at Sebring in Florida and the Le Mans 24 Hours in France and Brazil.
Sean Lamont could be a doubt for Scotland's Autumn Tests after picking up a suspected damaged jaw or cheekbone in Glasgow Warriors' defeat by Northampton, but injuries for Stuart Hogg and Ruaridh Jackson are expected to be not too serious.
Tony Judd has confirmed his departure from Cricket Scotland, the Australian assistant coach becoming head cricket coach at the Northern Territory Institute of Sport in Darwin.
Scotland's cricket team were denied the first win of their South African tour when North West Dragons edged to a tense two-wicket victory.