Olympiakos v Manchester United: 10 reasons why United should fear tonight's Champions League opponents

From their daunting record this season to their fierce fans, Olympiakos could make it tough for United to progress

This is the first time Manolas will face English opposition, but it may not be the last if he secures a move to the Premier League. Some British newspapers are reporting that should Fabricio Coloccini leave Newcastle in the summer, Alan Pardew has lined u (GETTY IMAGES)

When David Moyes' side were drawn to face Olympiakos in the Champions League Round of 16, the red half of Manchester breathed a collective sigh of relief.

However, the Greek champions will by no means roll over, particularly at home.

Manchester United have been consistent all season in failing to reach their usually high levels of performance and have suffered some embarrassing defeats during the current campaign.

But could tonight see another one?

We've picked 10 things that the Red Devils need to be wary of in tonight's fixture.

Check out our guide below...