I dont think Roma will have that much of a problem of selling Pjanic to a top CL team like the ones mentioned for lesser fees especially since we are chasing him,they'll be desperate to sell abroad either way.
Bayern,Barca,Juve,PSG have built dynasties in their respective leagues while Madrid is still a massive draw either way.City have CL and Poop now.These are the only clubs i can see Pjanic going to and where he has better chances of winning trophies.At 26 yrs old,having barely won anything,winning something important would be a priority in his career just like most other players.I just dont see him as a mercenary who would only play for money.