I've heard there's a 50m release clause in his contract too.
And I've heard that it's 60m, not 50m.
Then, I've also heard that there is a 50m release clause in his contract, but it only kicks in from the summer.
I've also heard there's an informal agreement to talk if a 50m bid comes in, but nothing in his contract.
And I've heard there is no release clause of any sort in his contract.
In conclusion: I don't think anyone actually knows, despite their assertions to the contrary.