The 22-year old French striker has arrived at Reebok Stadium from Liverpool and Coyle is confident that he has the ability to score consistently for the Trotters and raise his profile as a quality marksman.
"We brought them (new signings) here in the belief they can make an impact - that is why they are here," Coyle said.
"Particularly with David [Ngog], we spent money on a player who we think will grow and take the club on rather than paying a fee for someone who is 32 and whose value depreciates from the moment you sign them.
"At every club I have been at I have looked to sign young players and invest in that value and look to bring them on, and particularly so with strikers. If David scores goals that value will soar, and I would expect it to do because of his quality.
"Any signing you make is a gamble, whether they be 18 or 34 because they come into a new club and have to get used to that environment.
"But I've always felt that any club I have been in charge of, it is an environment which is conducive to people coming in.
"I think all three are young, exciting players, and when you have that enthusiasm and ability when you get a chance it is up to you to go show what you can do."