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Manchester United are facing the prospect of a nightmare Champions League play-off against Roma, Lazio, CSKA Moscow or Monaco.

United's involvement in the August play-offs will be confirmed if Arsenal beat Sunderland at the Emirates on Wednesday.

And Louis van Gaal's side are on course to land a tricky tie when the draw is made in Nyon on August 7.

The worst case scenario is a tie with Roma, Lazio, CSKA Moscow or Monaco to win a place in the lucrative group stage.

United will almost certainly be seeded for the play-off draw thanks to their UEFA coefficient.

MORE: The full rundown of who United could get in the Champions League play-offs.

But Roma and Lazio, who are battling it out to finish third in Italy, Monaco, currently third in Ligue One with one game remaining, and CSKA Moscow are all ranked much lower.

And that could deny them a place among the seeds and open up the possibility of a two-legged showdown with United.

Second-place Roma lead Lazio by a point in Serie A with two games remaining. They play each other on Sunday.

If Monaco beat Lorient in their final game on Saturday they will confirm their place in the third qualifying round.

CSKA Moscow are third in Russia, level on points with FK Krasnodar with two games remaining. Finishing second will earn them a spot in the third qualifying round.

The first legs of the Champions League play-off will be played on August 18 and 19 with the second legs will be played on August 25 and 26.

MORE: Five things we learned from United's draw with Arsenal.

Click through the gallery to see how the fans rated the Reds against Arsenal.