Lukaku cannot be considered world class, that's for sure as he:
- consistently fails to score against any good PL side
- consistently failed to score in important CL matches
- consistently failed to score against the only top Serie A side: Juventus (0 non-penalties goals in 7 matches).
Also his Serie A numbers are overrated by most of the people as he scored SEVENTEEN penalties in the last 2 seasons (literally 36% of his Serie A goals have been penalties):
In the last 2 seasons he scored "only" 14 and 16 non-penalty Serie A goals. Those are not world class numbers and it's the italian league, not PL or La Liga.
He had a lot of assists last season it's true but because he was playing alongside Lautaro in a system that perfectly suited him. Pretty much impossible to have so many assists playing in the current system which is the worst possible for him as Chelsea crosses a lot and he's terrible at winning aerial duels.
I don't know why Chelsea signed him if then they keep playing Pulisic, Ziyech, CHO as happened yesterday.. Chelsea must play 3-5-2 with Lukaku -Werner upfront, if I remember correctly even Werner scored for fun in Bundesliga playing as SS.
Tuchel you're overrated, 3-5-2 Lukaku-Werner upfront is the solution.