The big Belgian is on-loan at Albion from Chelsea.
Regis told the Birmingham Mail: "He's certainly made an impact. On that goalscoring record I'd take him back next season - of course I would.
"But for me there is still work to be done. It's great he's coming on and scoring goals yet a player like that doesn't want to become known as just a game-changer.
"He has to be thinking 'I have to get more starts where I can dominate games'. He's proven he can come on for the last 30 minutes when the expectation levels are different.
"But he needs to force his way into a position where he starts more games. He needs to take coaching on board - which I'm sure he will."