The likes of Tottenham and Arsenal have been linked with the striker.
Iraola said: "For me as a manager, he is worth a lot of money.
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"The more expensive we put him, the better for the manager. I understand the club, I think we will try to keep him. It is what we want. We don't want anyone to come with the money but we know how the market works, but I will not be the one to put on the price.
"If I was to, it will be very easy for me to put it very, very expensive, but we will see. He has scored a lot of goals, he played very well, probably there will be offers for him, yes."