Earlier on in the season it looked as if the race for the Premier League title would be a two-horse race between the two Manchester clubs, but Manchester United have simply not been able to keep up with the pace set by their city rivals.
After a promising start Jose Mourinho's side have faltered in recent weeks, and they went into today's game against Burnley a whopping 13 points behind Manchester City.
They desperately needed a good result at home to Burnley to try and claw their way back into the race for the title, but they endured the worst possible start as they went into half time 2-0 down.
Although they were eventually able to finish on level terms, thanks to a brace from Jesse Lingard, it was still a disappointing day for Manchester United fans.
They managed to temporarily cut the gap at the table of the table to 12 points, but their city rivals have the opportunity to extend their lead to 15 points when they travel to Newcastle on Wednesday.
MOURINHO TAKES DIG AT MAN CITY AFTER BURNLEY DRAW
The Portuguese manager was clearly not happy after watching his players labour to a 2-2 draw at home to Burnley, and he made his feelings known in his post-match interview.
Mourinho even took a swipe at Man City, claiming his side simply do not have the spending power needed to compete with their rivals.
"Manchester City buy the full-backs for the price of the strikers," Mourinho said. "So when you speak about big football clubs, you are speaking about the history of the club."
And Mourinho claimed that Manchester United's rich history has forced them to pay much more for players, something he believes is hindering the club's success.
When asked about the £286 million he has spent since he was appointed Man United manager, Mourinho replied: "(It) is not enough, is not enough. And the price for the big clubs, the price for the big clubs is different from the other clubs, so the big, historical clubs are normally punished in the market for that history."
ARE YOU SURE, JOSE?
Mourinho had a pop at Manchester City for spending over the odds for players, but it could easily be argued he has done that himself.
For example, Pep Guardiola only paid £28 million for Gabriel Jesus. Mourinho paid £75 million for Romelu Lukaku. Not even the most passionate of United fans can argue that signing the Belgian was the better deal.
The Portuguese manager has also seemingly wasted £31 million on Victor Lindelof: who has played just 563 minutes since being signed in the summer.
Although Guardiola has spent slightly more than Mourinho has in the past few years, Mourinho's men should be performing better considering the massive amount of money they have spent themselves.
Football fans were quick to pick up on Mourinho's comments, with many slating him for his what many believed to be a 'poor excuse' for his team's failures.