Speaking to the media, Frank said: "You should ask Phil Giles (director of football) and Matthew Benham (owner) about that because they will be even better to answer that question. I'm pretty sure the answer will be that there is no price.
"I think it's all about the narrative. If you can score five goals in five then suddenly your price is through the roof. If a striker performs consistently over time then there is a good price. I know Ivan is a good player and he's proven that many times. Last season he was fantastic, he made his full England debut and I think he's a very good player."