O'Neill has told Sessègnon he has not done it enough this term.
"This lad, for the ability he possesses, should score double figures in a season," he said. "Into the penalty area, he's beating players and he should do better.
"He should finish them off because he can be mesmeric. When he dummies inside to come in, he's coming across the box, he does it in training sessions time and time again, he should just drop the shoulder, come inside and have the shot."