Louis van Gaal's side have been hugely disappointing in the Premier League this season.
The Red Devils have endured a disappointing season, which has led to speculation that Louis van Gaal may leave the club in the near future (via Talksport), but Beckham has suggested that his former side can still salvage their campaign by winning some silverware.
"It has been a disappointing season so far obviously because of the performances and the way we have played in certain games, but any silverware at the end of the year or any good run in any competition is successful," he told Talksport.
"Unless you win everything at Man United as fan and as a player you never think it is going to be enough, but at the end of a year where there has been a lot of criticism and the performances haven't been as good, to come away and be in an FA Cup final... there is nothing you enjoy more than going down to London, getting ready in your FA Cup suit and playing in these games."
While United are still fifth in the top flight, they find themselves 12 points adrift of table-toppers Leicester and six points off the top four. And having fallen out of the Champions League, they now have a job on their hands if they hope to progress to the next round of the Europa League, having lost the first-leg of their last 32 clash 2-1 to Midtjylland.
With silverware in those competitions looking very unlikely currently, the FA Cup surely presents their best opportunity of winning a trophy this term.
Having beaten Shrewsbury in the previous round, United face West Ham for a place in the semi-final. And if they can manage to go on and win the competition, van Gaal may take great belief from making the FA Cup his first trophy for the club, as it was also the first of Sir Alex Ferguson's tenure.
However, whether it will be enough to appease disgruntled fans remains to be seen.