Plenty of option for rotation mate. In some really easy games we could play a Yaya Pogba two man midfield, Silva, De Bruyne and Sterling will all play 50+ games
I don't believe Yaya, De Bruyne or Pogba will be wanting regular rotation. Although hope we rotate Yaya more often if he becomes tired, WC and African Nations knackered him out last season.
Not sold on Yaya/Pogba as a two, neither will be good enough to be the defensive midfielder, even against the lesser teams in the league.