The Manchester City captain was expected to be out for three weeks after sustaining a thigh injury against Everton last month.
However, Kompany has already missed seven matches, and the Belgian FA have now sent their physio to assess the defender.
Maesschalck told Sky Sports: "I think Vincent is going to be ready in several weeks. We will do everything we can to bring back Vincent in a good way for a long time.
"First of all he had a rupture, a tear into the abductor and then also he has bad luck with a small thing on the front side now, so it's everything together.
"It's not really so long - eight weeks (the potential length of Kompany's lay-off) is nothing in the time of injury; you must respect biology."
Belgium take on Colombia on Thursday before facing Japan next Tuesday.
‘I don’t think Liverpool would look at Ollie Watkins, a striker isn’t a pressing issue for them – it’s Arsenal who need one’ Former Reds star explains why his old club don’t need an out-and-out forward this summer
‘He’ll still be playing at 40 at a good level because he’s in such good shape and looks after himself so well. He does everything to be a top professional’: Ex-Liverpool coach insists Mohamed Salah has plenty more miles in the tank
