It’s no secret by now that life at Old Trafford has been less than thrilling this season. One competitive year removed from a Barclays Premier League championship -- the 13th and final title in the 26 years under legendary boss Sir Alex Ferguson -- Manchester United finds themselves struggling to land in the top four of the twenty-club league, with the Red Devils currently in sixth position and 11 points shy of Liverpool for the No. 4 slot. To make matters worse, United recently suffered a 2-0 loss to Olympiakos in the UCL Round of 16, prompting first-year manager David Moyes to shoulder the blame in one of the worst losses of the 2013-2014 campaign.

“It's the worst we've played in Europe, that's for sure,” he said following the loss in Greece. “A really poor performance tonight. We never got going from the start and we didn't deserve anything because of the way we played tonight. We just never really got to grips with things. We came into the game in good form, a good mind set, but we didn't show that tonight. I take responsibility, it's my team and I'll always front it up. We didn't play well tonight and we have to play better. We can do. The one good thing is that there is the second game to go.”

The former Everton boss was reportedly given the next 12 matches to prove he’s the right man for the coaching job at Old Trafford, otherwise the Glazer family may feel the need to head in another direction after only a short period of time. Names like Pep Guardiola, Ryan Giggs, Diego Simone and Frank de Boer have all been tabbed as possible replacements should the Red Devils part ways with Moyes but as the season progresses and United prepares for the second leg of the UCL Round of 16 on March 19, here’s a look at four additional names who many believe could step into one of the brightest lights in professional sports.