77 minutes: A few substitutions.

For Porto, Samu makes way for ex-Liverpool midfielder Marko Grujic. A superb display from the striker with two goals to his name.

Eustaquio also makes way for Arsenal loanee Fabio Vieira.

United make a double defemsive change, with Martinez and De Ligt making way for Evans and Maguire.

75 minutes: Manchester United are pushing for an equaliser, peppering the Porto box with crosses and dominating in possession.

That said, nothing too troubling for the hosts to deal with thus far.

Porto might be sitting back but United need to be wary of not getting caught out on the break.

72 minutes: De Ligt latches onto the aerial ball but his header lacks power and it’s a comfortable stop for Costa.

Garnacho then cuts inside with the intent of firing one into the far corner, but his shot his blocked for the corner. The resulting delivery comes to nothing.

70 minutes: Fernandes goes for it again from outside the box, but shoots high and wide.

The way Costa is playing tonight, you can understand why getting shots away regardless of position may be the best policy for United. That’s their 20th effort of the night.

68 minutes: Attacking changes from Ten Hag as Zirkzee and Antony enter the fray.

Hojlund and Amad make way.

65 minutes: Save! Another big stop from Onana to prevent this going from bad to worse, getting down low to divert Samu’s effort away for a corner.

Resulting delivery nearly causes problems for United as Galeno pokes goalwards, but the Red Devils are able to clear.

Joshua Zirkzee is said to be getting stripped.

64 minutes: That might have gone out of the stadium!

Lisandro Martinez goes for the spectacular half volley from about 35 yards out – and as you’d expect from a centre-half, it goes high, wide and out of shot.

62 minutes: Mazraoui fires a pretty weak bobbling effort from the edge of the box – but it’s a poor parried save from Diogo Costa, who palms it right into the danger area with Garnacho closing in.

Garnacho is off balance and can only shoot high and into the side netting. But it’s another error by the highly-rated Portuguese shot-stopper.

57 minutes: United are spending more and more time on the ball – Porto, now with the lead, are sitting back and trying to frustrate their opponents.

Unable to break into the box, Garnacho unleashes a viscious effort from range to sting the gloves of Costa.

54 minutes: It’s United’s turn to search for an equaliser.

Bruno Fernandes fires an effort across the goal, hitting it with power but it goes well wide. Nothing to worry about for Costa.

Christian Eriksen then gets played into the box and takes the ball to the byline, but his pullback rolls straight into the arms of the keeper.

A better delivery and that could have been a golden opening for the visitors.