"Louis is a different type of player to anyone else I have at the club," he said.
"If you look at last season, he had already scored 12 goals up to the point where he got his injury in December. If he had stayed fit, he might have got us 30.
"He has already come on against Sunderland and scored an important goal for us and changed it for us against Sporting on Wednesday at a point when Wayne was starting to tire.
"If Louis stays fit, we have a big, big chance this year."