he doesn't need to, he can wait out 2 more years on good money and go for free to Man City, he knows his own game well enough to know that life would be miserable for him under Jose, he'd be dropped for not tracking back enough
I know you're struggling to accept this but Manchester United aren't the be all and end all anymore, City are a bigger draw, and Mahrez has made his mind up, this is the 2 clubs haggling over whether Patrick Roberts is included on top of the fee or making up part of the fee, Mahrez will be a Manchester City player