The comfortable manner of their display on the continent took many by surprise, with Porto an accomplished European outfit.
But now it seems as though Klopp’s side have at least one foot in the quarter-finals, as their opponents would need to score five unanswered goals at Anfield to turn the game on its head.
Klopp claims, however, than he won’t “rest” any of his squad, despite a trip to take on top-four rivals Man United coming just four days later.
“Another week now for Newcastle, then Porto and United in one week. All the people before the Porto game will tell me, ‘Now you can rest him, him and him’,” he told reporters on Saturday.
“Arsenal for example, that’s so unfair. They were through in the tie and had a final on Sunday yet I only hear after the game things like, ‘wow that was embarrassing against a Swedish team’.
“But they are through in the tie and played a final on Sunday.
“That’s the situation. We play Man United, we will not rest anybody. We will play a strong side against Porto and a strong side against United.”
But Klopp’s insistence that he won’t be rotating his side to avoid fatigue merely serves to further his praise of Liverpool’s squad depth.
However, to interpret his most recent comments as suggesting some of his key players won’t sit out would be remiss.
Changes are unlikely to be wholesale, but fielding effectively the same side against Newcastle (March 3), Porto (March 6) and United (March 10) would be negligent.
Klopp will be aware of this: during the Reds’ most recent congested run, playing Swansea City, West Brom and Huddersfield Town over the space of nine days last month, he made nine changes over two games.