Icardi for sure.
He's a strong contender for most dislikable player in the world, but he's quality.
+ gagliardini. he's a physical, big guy, good on the ball, wins duels (he lost 9 and won 6 yesterday, tho), passes like a champ, arrives easily in front of the goal, etc. of course he's inexperienced, players rarely win a derby at 22, but he screams quality. what a bargain for 22-25m. also, brozovic had a great month before the derby, he'd been unanimous yesterday.
this inda squad is arguably the strongest they've had since mourinho left them. still, their defense is shaky, they don't have any decent attackers besides icardi (ok, perisic is useful against minnows), so their only balanced section is the midfield. gagliardini, brozovic, mario, even banega and kondogbia (who's a great dm, just not a pogba-like attacking force as some might like him to see) would be starters for most serie a teams.