"He is training with the first team," Benitez told Liverpoolfc.tv. "Maybe he would find it difficult to play 90 minutes right now, but he will be able to.
"We have known the player for one or two years. He was in the last year of his contract and was a good price. He is a young player and has a lot of experience to gain, but he can also give a lot to us now as well as in the future."
Benitez also said of the former PSG prospect: "He can play as a target man, but he is not strong because he is still very, very young.
"He has quality, though. He can keep the ball and pass it, and he has good movement.
"I think he has game intelligence, and yes, okay, he needs to improve physically a bit, but that will come with time and he works really hard.
"It would be difficult to compare him to anyone now, I would advise the supporters to see him play and then it will be easier for them.