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He didn't play agianst Chelsea, but Lukaku's influence at West Brom has been significant this season.
There are times in a player's career that an absence can often lead to their reputation increasing. Take Jack Wilshere at Arsenal, for instance.
The 21-year-old midfielder is an incredible talent and is en route to becoming one of the club's finest players. He missed all of the last campaign due to a troublesome ankle injury, and many Arsenal fans were of the belief that the club's problems would miraculously be solved upon his return.
We all know that's far from the case, but Wilshere, already adored by Arsenal fans, suddenly became a messiah during his injury lay-off. And of all of this without him kicking a ball in anger throughout 2011-12.
Bringing him back to the starting lineup was supposed to move Arsenal closer to a credible title challenge, but while he's solved one problem in midfield, others have reared their head elsewhere on the pitch.
The same can be said for Romelu Lukaku, with Chelsea fans watching on in awe as his performances this term continue to catch the attention of Premier League crowds. The only problem is, he's doing it on loan for West Bromwich Albion.
He missed Saturday's game as he's unable to play against Chelsea as part of his loan agreement. And if anyone was in doubt as to his influence at The Hawthorns this year, surely Saturday's game would have convinced them otherwise.
Without the young Belgian, West Brom were toothless in attack. They enjoyed a brief spell of promise as the game closed out, but for large parts of this outing, they were weak going forward and lacked the physical presence Lukaku brings.
By not playing against his parent club, Lukaku probably enjoyed his most convincing display of 2012-13.