Adam Lallana remains a key man, insists Jurgen Klopp

The England midfielder has not started a match since the FA Cup win over Everton in early January after two setbacks from a thigh problem saw him miss the first four months of the campaign.
Lallana has managed just 186 minutes of Premier League action since making his comeback from that pre-season injury in November, but against Porto he could be in line for his first European appearance since the 2016 Europa League final defeat to Sevilla.