Liverpool 'headache' Jurgen Klopp has always wanted made clear by three players
Andy Robertson prompted huge cheers from the Liverpool support as he embarked on a trademark thrust beyond several players down the left flank into the penalty area.
Divock Origi drew a free-kick in a dangerous position after his pace and raw strength saw him power past his marker.
And Jordan Henderson drove forward to accept a backheel from Mohamed Salah before playing a reverse pass to his team-mate.
Only the last action resulted in a goal, Salah finding the bottom corner to net his 17th of the season and secure a 2-0 Champions League win for Liverpool at home to Porto on Wednesday evening.
Collectively, though, the almost instant impact of those three substitutes represented something Jurgen Klopp hopes has far greater resonance than the Egyptian's game-clinching strike.
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