Goals from Naby Keita and Roberto Firmino earned Liverpool a 2-0 win over Porto on Tuesday as Jurgen Klopp’s side took the upper hand in their Champions League quarterfinal tie despite not killing off their Portuguese opponents.

There remains plenty of work to do for the Premier League leaders, who will be disappointed they were unable to gain a bigger advantage for next week’s second leg.

On a bitterly cold night at Anfield,