Wolves fan here (but living in Manchester and much prefer City over United haha).
Rumour was that Nunes had an agreement with us that if City or Liverpool didn't come knocking by August 15th then he'd join us. I reckon we'll get two years max out of him before he'll join yourselves or Liverpool, but hopefully during those two years we get a solid push for European football going. Our owners own a large percentage of Mendes' company which is why we manage to get these deals, and we also won't stop him from leaving when the time comes like West Ham likely would have.
Where the rumour originally started: