Gary Neville is warning United cannot afford to dither in Denmark on Wednesday evening against Copenhagen, and has urged the Reds to ensure qualification to the knockout phase with a win.
United are within touching distance of the first round having recorded three wins out of three in their opening Group F fixtures.
If Benfica fail to beat Celtic, a draw against FC Copenhagen will be good enough for United to guarantee qualification. However, if Benfica gain victory over Gordon Strachan's side at the Estadio da Luz, the Reds must win in Denmark to ensure they progress.
Having seen off Copenhagen 3-0 at Old Trafford two weeks ago, the Reds are big favourites to claim another victory over the Danes. However, the United skipper, who misses the match due to a calf injury, insists the team will not underestimate their opponents and says only victory will do.
"We'd be shooting ourselves in the foot if we're didn't qualify now so it's important we produce a good performance on Wednesday," Neville told Manchester United Radio.
"At the start of the season we wanted to put right what we did so badly wrong during the last campaign and I think we've played some good football in our three games so far.
"The latter stages of the competition is where we want to be and where the club believes it should be; the players and the fans feel the same.
"You never know what can happen in the final one or two matches and we've suffered disappointment in the past," added the 31-year-old. "We're therefore very pleased to be in control of our own destiny. Hopefully we can get the result we need on Wednesday."
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