Manchester United hit a new low under Ruben Amorim as they suffered an embarrassing defeat to Grimsby Town in the Carabao Cup second round after an epic penalty shootout following two errors from goalkeeper Andre Onana.

The pressure was already building on Amorim after failing to win either of their first two Premier League games and now, without European football, their chances of silverware this season have suffered a huge blow.

Bryan Mbeumo missed the 26th penalty of a marathon shootout to send the League Two side through after the tie had finished 2-2 in normal time.

Onana, making his first appearance of the season, was at fault for both Grimsby goals, allowing Charles Vernan’s 22nd-minute strike to go through him at his near post before missing his punch at a cross which gave Tyrell Warren a tap-in eight minutes later.

“It’s car crash TV as far as United and Onana are concerned,” said Sky Sports’ Alan Smith on co-commentary. “It always transmits to your defenders if your goalkeeper is a nervous wreck.”

Grimsby were then denied a third in the second half when Cameron Gardner’s strike was controversially ruled out for offside after Harry Maguire was deemed not to have intentionally played the ball, which set the striker through on goal.

Just three minutes later, Mbeumo, who came on at half-time, pulled one back with a placed effort for his first goal for Man Utd. The visitors threw everything at Grimsby late on and finally their pressure paid off when Maguire headed in from a corner with two minutes remaining.

But Man Utd failed to hold their nerve with Matheus Cunha seeing his spot kick saved when he had a chance to win the shootout, before Mbeumo missed with his second attempt to pile the pressure on Amorim.

More to follow.