It seems that Liverpool mean serious business with their transfers this summer.
Six players have already moved to Anfield for a combined fee of around £70 million, and there looks to be more to come.
One area Jurgen Klopp will certainly want to improve, is left-back, where they had a number of problems last season.
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Spaniard Alberto Moreno was the Reds' first choice left-back throughout last season, but he isn't up to the sort of level Liverpool are after.
Moreno was constantly criticised for his performances last season, mainly for his poor positional awareness and tackling skills. He was at fault for a number of goals the Reds conceded, most notably in the Europa League final defeat to his former club, Sevilla.
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It seems almost inevitable that Klopp will enter the market for competition for Moreno this summer. Jose Enrique and Brad Smith have both left the club, while Jon Flanagan looks set to go out on loan, leaving the 24-year-old as the only recognised left-back in the squad.
PSV Eindhoven's Jetro Willems is one who has been linked with a move to Merseyside, and he would definitely be a good addition. The left-back has been with the Dutch side for five seasons, and has consistently been a strong performer.
Willems would certainly be the sort of player that Klopp is looking to buy. The German is clearly looking to buy players who can play a role now, whilst also improving for the future, and at the age of just 22, Willems fits the bill perfectly.
Despite his age, Willems doesn't lack experience. He has already made over 100 appearances in the Eredivise, and has been capped 20 times at international level, including matches at Euro 2012.
Most importantly, Willems is much better defensively than Moreno, even if he does not offer as much going forward. The Dutchman is still a technically sound player, and will certainly improve the Liverpool squad.
The Reds have been long linked with a move for Leicester City's Ben Chilwell, but given that the youngster has now signed a new contract at the King Power Stadium, that move looks unlikely. Willems, on the other hand, is entering the final year of his contract at PSV, so may be available on a cut-price deal.
Liverpool will definitely be entering the market for a new left-back, and given the excellent form Willems has shown in the Netherlands in recent years, he could certainly be that man.
Where else does Jurgen Klopp need to strengthen this window? Leave us YOUR thoughts in the comment section below!