Harry Maguire’s injury-time equaliser saved Manchester United boss Erik ten Hag from another damaging defeat after the Red Devils blew a 2-0 lead in a 3-3 draw at Porto in the Europa League on Thursday.
Marcus Rashford and Rasmus Hojlund had given the visitors a dream start with two goals inside the first 20 minutes.
Rashford’s promising display was cut short at half-time as he was replaced by Alejandro Garnacho.
Onana produced a fine save inside the first two minutes of the second half to deny Francisco Moura at his near post.
But that warning shot was not heeded as the United defence was shredded once more by a sprightly Porto counterattack on 50 minutes.
A double from Samu Omorodion, after Pepe brought Porto back into the game, had the English giants heading for defeat.
United then had captain Bruno Fernandes sent off for the second consecutive game, but the 10 men salvaged a point when Maguire headed in a corner.
Ten Hag’s men have now begun their Europa League campaign with two draws after being held at home by FC Twente last week.
And the manner of their capitulation after a fast start will do little to ease the pressure on their manager ahead of Sunday’s daunting Premier League trip to Aston Villa.
