Not every summer signing is a guaranteed success like Arsenal's Petr Cech or full of excitement like Manchester United's Anthony Martial.
Players can struggle to get going, and end up losing their place in the side very quickly - or in other cases not end up getting an opportunity at all.
We have put together a team of summer signings each either already forgotten or at risk of becoming that way as they begin to fall out of favour...
GK: Sergio Romero (Manchester United)
Romero started the season as United's first choice, with full faith from Louis van Gaal. It was looking good, then he made a terrible error against Swansea, and a paperwork issue meant David de Gea's sale to Real Madrid did not go through. De Gea has recaptured his place in the side, meaning Romero faces a season on the sidelines.
DF: Tiago Ilori (Aston Villa)
Tiago Ilori has spent successive seasons on loan in Spain and France since being signed by Liverpool in 2013. This was supposed to be the year he made an impact in the Premier League, and a loan deal at Aston Villa seemed set to provide that. Instead he is yet to play a single minute of action, and Liverpool could do with him back after suffering defensive injuries.
DF: Kevin Wimmer (Tottenham)
Kevin Wimmer's move from Cologne to Tottenham has been put in the shade by the club snapping up Toby Alderweireld from under the noses of Southampton. The Belgian's partnership with Jan Vertonghen has meant Wimmer has yet to play at all in the Premier League, and has played in just one of four Europa League games.
DF: Papy Djilobodji (Chelsea)
They wanted John Stones, but ended up with Papy Djilobodji from Nantes. The move surprised even many French football pundits, and the defender is yet to break into the side despite their struggles for form. Like Wimmer and Ilori, he is yet to feature in the Premier League.
MF: Serge Gnabry (West Brom)
It was not too long ago that Serge Gnabry was being hailed as Arsenal's next superstar. Injury curtailed his progress last season, and a move to West Brom was supposed to get him back on track. So far he has not impressed Tony Pulis, who has used him only sparingly as a substitute, much to the frustration of Arsenal fans.
MF: Marco Van Ginkel (Stoke)
Marco Van Ginkel began the season in the Stoke City side, but is in danger of becoming a forgotten option, relegated to the bench in recent weeks. In the last five games Stoke have put together their best run of the season, unbeaten in that stretch, and the longest he has been on the pitch in any of those matches has been for 21 minutes.
MF: Michail Antonio (West Ham)
Michail Antonio was prolific in the Championship for Nottingham Forest last season, and West Ham committed a sizeable fee to sign him. So it is surprising he has played only 31 minutes of Premier League football since arriving on deadline day. This could soon change, with star man and fellow summer signing Dmitri Payet sidelined for three months with an ankle injury.
MF: Patrick Roberts (Manchester City)
It comes as little surprise that former Fulham winger Patrick Roberts is struggling for game time at Manchester City. Previously established Premier League players like Adam Johnson and Scott Sinclair have seen their careers go off rails at The Etihad, and making the step up from the Championship was always going to be tough. The teenager has played just four minutes in the Premier League this season.
FW: Radamel Falcao (Chelsea)
Remember when Chelsea fans were telling Manchester United supporters they would rue not signing Radamel Falcao? The voices have quietened now, with Jose Mourinho's magic touch deserting him. Falcao cannot displace a woeful Diego Costa from the side, and has scored just once all season.
FW: Obbi Oulare (Watford)
Watford spent £6 million to sign Obbi Oulare from Club Brugge, but the striker is yet to make his mark. Troy Deeney and Odion Ighalo are deservingly keeping their places in the team, and Oulare is yet to play a single minute, and has had to make do with playing for the under-21s.
FW: Clinton N'Jie (Tottenham)
Tottenham bought Clinton N'Jie after being priced out of the market for Anthony Martial, and the Cameroon international is yet to really show what he is capable of. He has not started a game in the Premier League, with just five appearances from the bench, and has made one start in the Europa League, and is still to score a goal.