Boss Alex McLeish fears Birmingham may not be able to keep striker Cameron Jerome if he adds extra goal-power to the other assets of his game.
Jerome has often been praised by McLeish for his work-rate, pace and power and was City's leading scorer last season with 11 goals.
McLeish believes he only needs to add a greater composure in front of goal to become the complete striker.
But he accepts it would be hard for the midlands club to then retain the services of the former England Under-21 striker who has just recovered from an ankle problem.
McLeish told Press Association Sport: "It is great to have Cameron back. He is a powerhouse, he has got a lot in his locker. But he can still can improve the final thing, the finishing. Cameron should be one five goals now this season with the chances he has had.
"It is just about working on trying to have ice in the head in the final third (a cool head) as Ian Wright used to say rather than just tightening up a bit. If he goes to that level, we will probably not be able to keep him. I would think a bigger club would want him, a guy with pace and power. If he gets his finishing up to a level, he will be a guy who would go to a higher level."