Paul Pogba's world record transfer fee of £89.3 million could be weighing on his shoulders, according to former Manchester United midfielder Bryan Robson.
Pogba has fallen short of expectations since his summer move back to United from Juventus, and Robson thinks "the fee can weigh on him."
Here, we look at United's most expensive signings and assess how they have fared:
Paul Pogba (Juventus, £89.3m, Aug. 2016)
Pogba arrived at the club in a world-record move that comfortably surpassed the £85m fee that Real Madrid paid for Gareth Bale in 2013. Manager Jose Mourinho proclaimed that the Frenchman could be at "the heart of this club for the next decade and beyond." United have struggled to bring the best out of him so far, seemingly stifling him in a 4-2-3-1 formation, but he has been a letdown when pushed further up the field too.
Verdict: Jury's out
Angel Di Maria (Real Madrid, £59.7m, Aug. 2014)
The Argentina international arrived at United in a British record move after being man of the match in the Champions League final and with more than 50 caps for his country under his belt. Manager Louis van Gaal described him as a midfielder with "immense natural talent." Just a year later, he was sold to Paris Saint-Germain for £44.3m after early promise faded. The goals and assists dried up and he was played in six different positions.
Verdict: Flop
Juan Mata (Chelsea, £37.1m, Jan. 2014)
Mata arrived in dramatic fashion in a helicopter and became United's record signing at the time when manager David Moyes brought him in. The midfielder won the Champions League with Chelsea and was their player of the year in back-to-back seasons, but he had been frozen out of the team by their new manager Mourinho. Mata has shown his use and, even when Mourinho took over at United, his admirable attitude, leading to him wearing the captain's armband on Saturday against Burnley.
Verdict: Success
Anthony Martial (Monaco, £36m, Sept. 2015)
Martial was the world's most expensive teenage footballer when he joined from Monaco but he was relatively unknown, leading one national newspaper to splash with the headline "what a waste of money." That prompted a chant in his honour from the United crowd, reflecting just how much he has been proving the press wrong. The Frenchman certainly shone last season, but it has been more of a struggle this campaign and he was left out of the matchday squad for Saturday's game against Burnley.
Verdict: Jury's out
Memphis Depay (PSV Eindhoven, £31m, June 2015)
Depay had worked with United manager Van Gaal at the 2014 World Cup, when Netherlands reached the semifinals, and he finished as the Eredivisie's top scorer with 22 goals in the following campaign for PSV Eindhoven. After an early run of starts for United, he lost his place -- making mistakes, lacking end product and seeming to be short of confidence. He was left out of United's 21-man Europa League squad for Thursday's game at Fenerbahce despite lack of game time.
Verdict: Flop
Dimitar Berbatov (Tottenham Hotspur, £30.8m, Sept. 2008)
Berbatov finally made the move on deadline day at the end of a summer transfer saga that upset Tottenham, who thought the pursuit of their striker was "disgraceful." The Bulgarian often showed the touch and class that made him such a success at White Hart Lane despite a languid style. He managed 56 goals in 149 appearances over four years at United en route to winning the Premier League Golden Boot in 2011 and two league titles before moving to Fulham.
Verdict: Success
Eric Bailly (Villarreal, £30m, June 2016)
Bailly was the first signing of the Mourinho era at United after having shown his potential against leading La Liga sides for Villarreal and also on international duty for the Ivory Coast. Despite his young age (22), he has been the club's best defender so far this season, looking strong and assertive. It is too early to judge if he has been a success, though, and he has not been helped by the setback of a knee injury suffered against Chelsea, which could keep him out until Christmas.
Verdict: Jury's out
Rio Ferdinand (Leeds United, £29.3m, July 2002)
Ferdinand became the world's most expensive defender for a second time when he moved to United, breaking his own record of £18.5m when he was transferred from West Ham United to Leeds United two years earlier. His switch from Leeds was also a British transfer record fee, although the Yorkshire club were thought to value the player considerably higher than that amount. The England defender went on to stay at the club for 12 years, securing a Champions League winner's medal and six league titles.
Verdict: Success
Ander Herrera (Athletic Bilbao, £29m, July 2014)
Herrera was the first signing made by Van Gaal at United, who had attempted to sign him a year earlier when previous boss Moyes was in charge only for the deal to fall through in farcical circumstances. The Spanish midfielder, who arrived with 15 caps for the Under-21s, had impressed against United while playing for Athletic Bilbao. He was not a regular starter at the end of last season but has reinvented himself brilliantly in a defensive midfield role this campaign.
Verdict: Jury's out
Juan Sebastian Veron (Lazio, £28.1m, July 2001)
Argentina midfielder Veron arrived as the most expensive player in British football history, coming from Lazio, who he had won the double with a year earlier. United manager Sir Alex Ferguson described him as "one of the best players in the world" when the player signed, but by the end of that season he was raging at journalists for their criticism of Veron. A year later, he joined Chelsea for £15m, with Ferguson confirming that the player had been on a "massive salary."
Verdict: Flop