Cavani will be very hard/nearly impossible for us to sign due to wages, transfer fee, competition from other teams etc.
However, it makes me laugh to see how many people underrate him. If we were to sign Cavani and Darmian while keeping Tevez this summer our team would be ridiculously competitive on all fronts. Tevez-Cavani up front would be an absolute nightmare for any team to play against. Work rate out of this world from both. Flair, creativity, speed and finishing from Tevez. Strength, aerial presence/ability, hold-up play, technical ability from Cavani. Not to mention we still should have Morata for years to come. Replace Pirlo with Veratti if it becomes possible and our team could be quite incredible for a good few years.