This season has seen some superb signings make their mark during their debut campaign in the Premier League.
The likes of N'Golo Kante, Andre Ayew, Kevin De Bruyne, Dimitri Payet and Georginio Wijnaldum are five players who certainly fit that bracket.
But what about when it doesn't quite work out?
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There have also been some players who fans may have forgotten had even joined their club, such has their impact been so underwhelming.
Here we look at six of the biggest Premier League flop signings of the season.
Juanmi (Malaga to Southampton, on loan)
With such fierce competition for the striking spots at the Saints, it's vital to stand out in training in order to get a chance at the weekend.
Shane Long and Graziano Pelle have both been in fine form while they also have Jay Rodriguez and Charlie Austin to call upon.
Clearly the Spaniard hasn't done enough to impress Ronald Koeman this season, as he hasn't started a single game, and has barely made it off the bench.
Unsurprisingly, he has scored a total of no goals, but something has tempted Real Sociedad, as they are reported to have lined up a deal for the 22-year old this summer.
Adama Traore (Barcelona to Aston Villa, on loan)
Traore was seen as something of a coup when he arrived at Villa Park, rated as one of the top stars in Barcelona's La Masia academy.
But he has been nothing short of disappointing during his time in England, barely making it off the bench and not having much of an impact when he has.
The fact he has struggled to get into a side as poor as Villa's is a worrying sign for Barcelona and is likely to make potential suitors wary of making a bid.
Gokhan Inler (Napoli to Leicester, £3m)
The Swiss midfielder was seen as a marquee signing by Claudio Ranieri and the Foxes when he joined from Napoli in August, for a cut-price of £3m.
But he has made little impact on the club's title-winning season, barely qualifying for a league medal.
You could argue that the incredible form of Danny Drinkwater and N'Golo Kante has kept him out of the side, however, a player as good as Inler, should have started every week if he showed the same form as he did in Italy - clearly that wasn't the case.
Nordin Amrabat (Malaga to Watford, £6.1 million)
Another Malaga player who has struggled to adapt to life in the Premier League is playmaker Nordin Amrabat.
The Moroccan was a major investment by Watford, as they paid just over £6 million to land him.
But he has repaid very little of that fee, only making four starts and registering no goals or assists.
If he fails to improve then it will be a big sum wasted by the Pozzo family.
Juan Iturbe (Roma to Bournemouth, on loan)
The newly promoted Cherries pulled off what was seemingly one of the shrewdest and most impressive transfers of the summer, when they landed the highly rated Iturbe on loan from Serie A giants AS Roma.
But his time at Bournemouth has been a massive disappointment, as he has failed to start a single league game.
Quite how or why he has not shown his obvious potential is uncertain, but Eddie Howe was clearly not impressed by the Paraguayan.
He could have been a major player had he been in form, the only positive for Bournemouth is that they didn't invest any money in him so they haven't really lost out.
Memphis Depay (PSV to Manchester United, £25m)
Manchester United splashed out a cool £25 million on Depay, following a stand out season, in which he scored 22 goals in 30 games from the wing at PSV Eindhoven.
However, he has shown very little of the talent that lit up the Eredivisie last year. He has scored only two goals and contributed one assist in 16 starts at Old Trafford.
He has largely been used as a substitute in the second half of the campaign, with Louis van Gaal preferring the likes of young England stars Marcus Rashford and Jesse Lingard.
Depay has been heavily linked with a move away from Manchester after just one season, and if this happens, then he will go down as one of the worst signings the Premier League has seen.
Have we missed anyone off the list? Have YOUR say in the comment section below!