"If you're talking £15m for Zaha, Thomas has got to be £25m," Ince told BBC Radio Lancashire. "If you compare the two, Thomas should cost more. Zaha is a fantastic player, don't get me wrong. Zaha's a stronger runner and does a lot of tricks, whereas Thomas is more direct, he makes things happen and he scores goals.
"You've got a kid playing in the Championship who has scored 18 goals. When you look at the leading scorers, they're all strikers, and he's there amongst them. Potentially, I think he can reach that value."
Reports have claimed that Liverpool are willing to offer £4m in the summer for Ince's services, while Spurs could lodge an £8m bid.