Januzaj, instead of featuring for the Red Devils last Friday, played for United in the U19 Nike Academy Cup on Saturday against AS Monaco.
"I do not doubt his abilities," Wilmots stated "But he has not played much at Manchester United. I must remain honest with the other players. Yannick Ferreira Carrasco, Dries Mertens and Nacer Chadli play with their clubs regularly and the competition for the position is huge.
"Januzaj was not there because he plays too little, that's a decision I have to make.
"Maybe he's back in two months, maybe then it's a different story."