Not really, ok i get the English thing might put that price up a bit, but if we can get that for him, there is a reason why an ambitious club would want him.
We have 3 center backs, Mina is questionable over his fitness and Zouma we might not be able to buy anyway, to sell Keane we would be mad. Season after season we sell our best players, then wonder why we have to start again and again.
He's 26, its not like he is 29 like Gana, and is only 18 months into a 5 year deal, 50m would be pathetic
Holgate is better on the ball and is a much better athlete. He only lacks growing into his body.
Not making a massive profit on Keane would be dumb. He will always be slowish.