This had better work, because it's.....impossible to find good arguments for why we'd go with Martial over Sancho (or Pogba, or Lingard) in this game, given what we have to prove here. If we're going to string together some kind of attacking game that isn't as inefficiently over-direct as we've been in the last few games, Sancho should be key to that while Martial clearly is not. Sancho is also a better player, is in better form (though that would be true of almost anyone), and is in danger of becoming a distraction and losing confidence through lack of playing time. If this is rotation, then Martial should not be part of any regular rotation, Sancho should - and Lingard has done enough to at least earn consideration for that.
Completely fine with Cavani for Ronaldo - can't play CR every game, and he's not that much of a downgrade.
Also, I would have liked to see Matic start, although primarily with Pogba on the pitch too.