This.
If (IF) we lost Martial to get this guy I actually think it'd be a move that could essentially end up costing Mourinho his job...
What I mean by that, is that as soon as the chips were down, it'd be what everyone went back to, and I could imagine it becoming an almost comedy decision.
I'm a massive, massive José fan - but if that happened, I'd be so pissed off by it that I think it'd make my demands of Mourinho go up, like, 'ok, you fecking better get this team playing well right now then', and I reckon it'd have a similar effect for a lot of fans.