Juve: De Ligt seems like he's doing good again after an iffy first season, so I'd swap if they're up for it.
RM: Don't think there's a swap deal on, they wouldn't want to let go of any players we might want (Vini, Hazard, Varane, Casemiro -- limited to Wingers, CM, CB because those are our weaknesses)
PSG: Beyond the big two + Veratti, who would we want from there? They won't swap any of those 3 for Pogba. Given the economic troubles the middle east is in, it'd send a bad political message if they splash out on football players. I think this is pretty unlikely.
Barca: They have more to offer, I think we'd be interested in Dembele, Fati and Dest (right age profile + position requirements) and they might be tempted by the prospect of Pogba at his peak.
Chelsea: This will be really interesting - they're not afraid to pony up the cash for PL players and Kante + Pogba is a great midfield duo. Havertz hasn't really worked out for them. Maybe they'd be willing to just straight up pay 70-80m. Don't really see the difference between Chelsea and us from Pogba's perspective. Still top four aspirations, very limited CL win chances. I think he'd rather see out his contract and go be a part of the rebuild effort at one of the spanish clubs.