Mendy is a LB so would be exactly what you need. Silva and Moura are more interesting - you have a good number of wingers already so who will leave?
The only must do deal is for a striker. Kane is looking very unlikely, Sanchez almost impossible. Lukaku could happen but somehow I am not sure that JM rates him (I'm in that camp too!)
Lots of reports that Mourinho really rates him now - can see why as he would fit into your team easily in Zlatan's role.
I wonder if there is anything more than simple coincidence that JM is in Monaco this weekend .........................
Got to be honest and ask is he any good? I have seen very little of him and can't really say he stood out in any games I did see.