"Playing football is the most important thing for me and I've got to be doing that, whether it's here or somewhere else," the striker, who was a target for Middlesbrough boss Gareth Southgate, told The Journal.
"If I'm not playing here, it (changing club) might have to be something I look at because I need football. That hasn't changed and it's something I'll deal with if and when the time comes. I'm focused on being the best I can be, but I can't do that if I'm not playing.
"It's not the best scenario, but if it ever came to it, I would have to make a big decision. But I still believe that I can help this club achieve what it wants to. You have to believe. If I wasn't good enough, I wouldn't be here."