#3 Manchester United

Players In: Fred, Diogo Dalot, Lee Grant
Players Out: Michael Carrick, Joe Riley, Daley Blind, Sam Johnstone, Devonte Redmond, Indy Boonen
Put simply, Manchester United have not strengthened enough to win the title this season. The fact that Chris Smalling and Phil Jones look the most likely to start in the centre of defence is enough proof that first place is out of reach. Top strikers will weave in and out of Jones and Smalling and sink United with ease. Although Lindelof and Eric Bailly are available, it's widely known that Mourinho's relationship with the pair is sour.
Diogo Dalot has been the only defensive player to be brought into the squad this summer, but even so, he's out at right-back, when the area that needs improving is the centre. As for Fred, I think he'll be a valuable asset in midfield, and will most likely sit back whilst Pogba strides forward. The third signing United made was Lee Grant - you can expect him to be used in a couple of cup matches here and there, but other than that: bench warmer.
Third place is a reasonable finish for Manchester United this season, as there's still a lot of work to do.