That 20 year old has scored against top level competition in the CL, he's a lot more experienced than his age gives credit for.
Anderlecht played the majority of last season with a 4-2-3-1 formation with Mitrovic up top - It wouldn't be anything he wasn't used to and I think that de Jong and Ayoze floating about being pests in the space behind would give him ample support.
I think Cisse is quite 1 dimensional and wouldn't work well up front as part of a two, he can't play off the shoulder as he doesn't have the pace and is shite at holding the ball up. Playing Cisse would mean someone would have to be shifted out wide. Impact sub for me like
I'm losing hope with Cisse. Scores goals but his link up and general combativeness is getting worse and worse.