With no Pogba it's going to be really difficult to contain Man City, We know City will have an extra man in the middle. Herrera seems to be all over the place when he's played this season at times following the ball to very wide positions of the field leaving Matic literally on his own with no one to make a quick short pass to. I fear Man City will really press Matic with two three players at times, knowing there's no Pogba allows team's to be really aggressive against us when they don't have the ball especially if they have an extra player in midfield, Liverpool game is a good example.
Matic will have a very difficult task against City, he will be our main distributor while being out numbered, at the same time he will have a big job defensively trying to contain City and their abundance of attacking options.