It's hard to predict. City is strong as fuck, but they can be beaten with a good strategy - the 0-1 against them was a masterpiece by José. Barca has fantastic players but Martino is clearly not a tactical genius.
Decent player but we don't need him. I think he is more useful behind the striker. We have Matic, Ramires, Mikel, Lampard and Van Ginkel in pivot and some really talented young players(Chalobah, Aké, McEachren). Get a great left back and a a striker and we are ready.
I think we have enough technical players, we rather need a beast like Lukaku. He showed in Everton that he can use his physique to protect tha attacking midfielders(Deulofeu and Barkley).
We don't need Suarez! Lukaku is 20 years old and is one of the best strikers of the league, Suarez was playing at Groningen at the age of 20. We need to trust in Romelu and help him to became a world class striker. He is talented enough.
They have several outstanding attackers(Messi, Agüero, Tevez, Higuain, Lamela, Di Maria), but therit midfield and defense is shit and they never work with decent coaches. Maradona, Sabella, Pekerman...
I think Lukaku will fit in. He is fast, strong and hardworking, José likes these kind of players. I think he showed in Everton that he can work for the team: he helps the midfielders a lot and assisted a few goals. I'm sure that he won't be sold this summer because at least two out of three strikers is leaving us.