That defeat saw the Belgians crash out of the Champions League 7-1 on aggregate and Parker's role is in now in serious doubt after the last-16 exit.
Asked whether he will still be in charge for Sunday's league game against Standard Liege, the former Fulham and Bournemouth boss, 42, said: "I am not sure. I am not in control of that.
"I understand why you are asking me that question and it has probably been aimed at me for some weeks now.
"I can't really control that. I am not in that position to understand it and you are asking probably the wrong person. What I am is fully committed in trying to turn this around and that is what I will try to do."