The French forward, 17, made his Fulham debut as a late substitute at West Ham in November and has recently returned to full fitness after injuring his hamstring in that game.
"He is a goalscorer, first and foremost," said Meulensteen. "Moussa knows where the net is and he is clinical in and around the box.
"He has a variety of finishes and he is a good athlete as well. He is a strong player and has got a great personality."
Meulensteen said: "I am looking forward to integrating him more in first-team training.
"There are many other young players coming into the group. That is what I did during my time at Manchester United and I am going to do exactly the same here."