He will not go cheaply like Bissouma has to Spurs.
He's only one year into his contract and has stated that he is happy at Brighton and loves working with Potter and the squad. The club have said they do not intend to sell, but obviously they would for a mega offer, but it would have to be big, possibly more than Ben White, I think they'd look at 60M, I gues its for City to work out if he's worth that to them.
It would be a big issue for us as left back has been our problem position for a while filled by Dan Burn, Solly March and even Trossard played there once or twice! Cucurella has fixed that amazingly, so the club would be very reluctant to let him go so quickly. But Tony Bloom has always said he won't stand in the way of careers if the offer is big enough.