Ally McCoist's men are scheduled to face Dick Campbell's outfit two weeks on Saturday, but it's an international weekend.
The Ibrox side would have already been without Lewis Macleod, who will be featuring for Scotland Under-21s against Georgia on Thursday and Arnold Peralta, who will be playing for Honduras against Brazil.
And Lee Wallace looks likely to be in the Scotland squad for the double-header with USA and Norway, with keeper Cammy Bell touted for a call-up too.
Now Northern Ireland have confirmed they too will play a friendly against the Turks in Adana on November 15.
That could mean that Andy Little and Dean Shiels may be included for the encounter.
Rangers controversially postponed their clash with Dunfermline earlier this month due to international call-offs, just over a week before the match was due to go ahead.
And it seems certain they will ask for another postponement against Forfar - the only side who have defeated them so far this season.
Meanwhile, the following Rangers games will be screened live on TV: Sat, Dec 14 v Stenhousemuir (a) BT Sport 5.30; Mon, Dec 30 v Dunfermline (a) Sky 7.45; Thurs, Jan 2 v Airdrieonians (a) BT Sport 5.30.