Salah might count himself fortunate to still be available for the second leg in Porto on April 17, after escaping punishment for a studs-up tackle on the shin of Danilo in the final minutes.
Porto will surely display greater attacking intent in their backyard, where they have won all four of their European games this season, but Liverpool know an away goal will boost their qualifying chances.
It took the hosts just five minutes to open the scoring as Keita got his second goal in as many games having waited nine months to open his Liverpool account.
After Keita's goal in the opening minutes off a deflection, Liverpool was in a fantastic spot while Porto had time to come back and put the pressure on.
Danny Mills believes Liverpool 'are getting away with it at the moment'.
Liverpool did most of the pressing in the second half - Sadio Mane coming closest from long range - but they were unable to find a third that would have all but ended the tie as a contest.
He also played three key passes, the most of any player against Porto, and had one second assist - his pass to Alexander-Arnold, who crossed to Firmino for Liverpool's second goal.
Against Manchester City and Roma last season and this year against Bayern Munich, Liverpool have not shied away from strong rivals and they can go up against any opponents in Europe.
Henderson has played 316 times for Liverpool since joining from Sunderland in 2011 and replaced club legend Steven Gerrard as captain in 2015.
As mentioned, Sergio Aguero makes our Team of the Year, and the Argentine is joined by City team-mate Raheem Sterling, who was the fourth and final player to be chosen by all of us here at Eurosport.
"Were we complacent? Maybe, but that may be natural when you have such a convincing victory and Liverpool have to treat this as a completely new challenge now". Porto will try everything to strike back - and that will be a really tough game again, but that's how it should be in the quarter-finals. All of them were really hard-working, and really good football too. 2-0 is a really, really good result.
With a comfortable Champions League quarter-final first-leg victory in the bank, Liverpool's players returned to Melwood on Thursday and turned their attention to Sunday's Premier League clash with Chelsea.
"We still have a lot of work to do".