The Manchester United goalkeeper watched from the bench on Sunday as David De Gea returned to the team in the 2-0 victory.
But Romero has played an important role in cup competitions this season, proving a reliable figure for Jose Mourinho.
The Argentinian is set to start tomorrow night at Old Trafford for United's crunch Europa League quarter-final second leg with Anderlecht (8.05pm).
After the 1-1 draw last week, the tie tomorrow is arguably the Red Devils' biggest game of the season.
Sergio Romero is in line to start in Manchester United's crucial Europa League clash tomorrow
Champions League football is still being chased, but their hopes of qualifying via the top four was boosted against Chelsea.
Not only that, Romero outlines United have earned valuable confidence ahead of the Anderlecht game from beating the Premier League leaders.
“The result at the weekend was very important in every way – tactically and in terms of morale,” Romero said.
Mourinho has previously claimed the Europa League was United's most realistic form of qualification for the Champions League.
Man United train ahead of Anderlecht clash Wed, April 19, 2017
Express Sport brings you all the best snaps as Manchester United train ahead of their clash with Anderlecht
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Manchester United train ahead of their Europa League clash with Anderlecht
Whatever we take part in we certainly want to go out and win
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But Romero has insisted they will compete strongly in the Premier League too.
He added: "As United, right from the start and the first game, it was a very important cup.
“Whatever we take part in we certainly want to go out and win.
"There is no such thing as an unimportant trophy.”