The Belgian has been in fine form for the Blues this season, managing 18 goals in the Premier League, just one short of leading goalscorer Jamie Vardy.
He currently stands on 60 goals in 132 Premier League games since 2012, a record that shows he is pushing to become an elite level striker in future.
However, of those 60 only 11 have came against the Premier League’s usual top six, in this case Arsenal, Chelsea, Liverpool, Manchester City, Manchester United and Tottenham.
This season he has managed just one goal against those sides compared to 17 against the rest.
He has averaged 0.28 goals per game in the Premier League against them since 2012, a far cry from his record of 0.53 per game against the other 14.
Compare him to Tottenham Hotspur’s Harry Kane over this season and last and the difference is startling.
In the last two seasons Kane has managed nine goals in 14 games against those top six sides, averaging 0.64 per game.
In contrast, Lukaku has managed just one goal in 21, with an average of 0.05 goals per game during the same period.
Both are arguably the two hottest young strikers in the Premier League at present, but that kind of form demonstrates that Kane is arguably far ahead in his development.
If Lukaku has desires to become a world-class striker in future, improving his record against the big sides is clearly where he needs to improve first.