United failed to protect what seemed a promising lead, thanks to Diogo Costa ’s goalkeeping errors, and allowed Porto a way back in, giving away “a totally unnecessary”, repeated Ten Hag once again, first goal. They provided Porto with the fuel and the hosts lit a fire in the hostile Dragao stadium, taking control of the game.

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Samu Omorodion's double looked like it had secured Porto the win, but Maguire came off the bench to score in the 91st minute