Nani could be back for the second-leg of their Champions League tie after recovering from a shin injury.
"He caused us a few problems," Deschamps said.
"With his pace on the ball he has the ability to speed the game up, but he is only one of United's armada of attacking options. We can't just think about Nani, there is [Wayne] Rooney, [Dimitar] Berbatov and Chicharito [Javier Hernández] to think about as well. They can pose problems for any team."