The summer transfer window is often seen as the most exciting time for football clubs, with big-name signings expected to bring in new talent and boost their chances of success in the upcoming season.

However, not all these transfers have been successful. Some players have arrived at clubs with high fees but struggled to make an impact on the pitch, leading to frustration among fans and management alike.

One such example is Manchester United, who have had a string of failed summer signings over recent years. In this article, we will explore some of the more notable flops from United's transfer history.

1. Juan Mata: The Spaniard joined United from Chelsea for £68 million in 2014, but his performances were far from convincing. He scored just six goals in 55 appearances for United, and despite being one of the highest-paid players in the Premier League, he was eventually sold back to Chelsea for a loss.

2. Paul Pogba: The Frenchman was signed by United for a record fee of £89 million in 2016, but his performance has been mixed so far. While he has shown flashes of brilliance, he has also struggled to adapt to life at Old Trafford, and has been linked with moves away from the club.

3. Anthony Martial: The French forward joined United from Monaco for a reported £27 million in 2017, but he has yet to fully establish himself at the club. His lack of consistency and injury problems have limited his opportunities, and he has only managed four goals in 36 appearances.

4. Romelu Lukaku: The Belgian striker joined United from Everton for a then-record fee of £75 million in 2014, but he struggled to find form immediately. He has since moved on to Inter Milan, where he has continued to struggle with injuries and inconsistency.

These are just a few examples of United's failed summer signings. Despite the high fees paid for these players, they have not lived up to expectations and have left many fans feeling frustrated and disappointed. It remains to be seen whether any of these players can turn things around and deliver the results that United fans expect.