The five-time Balon d'Or victor also drew a blank in prior quarter-final clashes with Juventus, twice against Atletico Madrid and in Barca's 2015 tie with PSG.
United face a two-legged quarter-final against Barcelona in April after staging a dramatic comeback from a 2-0 first-leg deficit to knock out Paris Saint-Germain on away goals in the last 16. The final, to be staged at Atletico Madrid's Wanda Metropolitano, will be held on June 1. "They're a team full of individual quality and are up there with the world's best". But can they pull off another shock by eliminating Juventus, and Cristiano Ronaldo, from the competition? I had until May to do whatever I could with the team, and playing style, mood, everything, has been going well. "They have a chance at the weekend to prove how good they are".
Mali forward Moussa Marega, with six goals in seven Champions League games this season, can pose a threat for Porto, but Liverpool are strong in every department and this could be the most one-sided tie in the quarterfinals.
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Manchester United's tie against Barcelona means caretaker manager Ole Gunnar Solskjaer will enjoy another trip to the Nou Camp, where he scored the victor in United's Champions League final win over Bayern Munich in 1999. This tie looks like Liverpool all the way.
An Ajax legend, Litmanen joined the Reds in 2001 after one season at Barcelona, but only played 26 times in one season on Merseyside.
In fact, you have to go as far back as April 2013 to find the last time Barca's leading goalscorer netted in a last eight tie.
City face a hectic schedule following next week's global break, including three games against Tottenham in the space of just 11 days.
England now makes up 37.5% of the teams left in European cup competition and the odds of an EPL club winning the Champions League are -150. Naby Keita is still a doubt, although Klopp did suggest he might make a decision on him based on a late fitness test.