What price is that?
At a guess I'd say that if we bought him and he had a poor season we could sell him for around £10M (we managed to get that for Bent).
So if we bought at £10M-£15M that doesn't really represent a substantial loss (in football terms). If we bought for £25M then the £15M or so we'd lose is almost our record signing value - clearly not something we can afford to risk.
So in answer to your question, as close to £10M as possible with a maximum of about £15M (what he's currently worth IMO).