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While it was no surprise that Liverpool attacker Roberto Firmino didn't start at Barcelona given he had only recently returned to training following an injury issue, the fact that the wasn't introduced until the 78th minute was perhaps a surprise, and one that left Arsenal fans on Twitter questioning Reds boss Jurgen Klopp.

The Merseyside outfit would have been hoping to pick up a positive result against the La Liga giants ahead of the second leg at Anfield next week, but instead they have a three-goal deficit to make up with their chances of reaching a second successive Champions League final now in tatters.

Firmino was only deemed fit enough to be named on the substitutes' bench against in Spain having missed the victory against Huddersfield Town on Friday night, but he didn't enter the field until the scoreline was 2-0.

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Arsenal supporters clearly feel that the German made a mistake in that regard, and they are probably right given they failed to take advantage of the attacking momentum they had in the second half at the Camp Nou.

One Gunner labelled Klopp as a "bottler" for not making the decision sooner, while another said "Klopp should've Firmino on sooner while they were on top".

Here is just a selection of the Twitter reaction...