Joleon Lescott - Aston Villa
It's little wonder Aston Villa are bottom of the Premier League when you look at who they signed over the summer.
Any one of Villa's long list of recruits could make a list of worst top-flight signings this season. But one has stood out above all others in recent weeks.
Indeed, Joleon Lescott's sale was a masterstroke from West Brom - and Villa fans are extremely unlucky to have been stuck with him.
Not only has the Aston Villa man's form been woeful, his desire has been severely lacking. And then there was that tweet...
Sebastian Coates - Sunderland
Sunderland have been stuck in the relegation zone throughout the current campaign too, however, and their summer business is a big reason why.
Sam Allardyce has steadied the ship somewhat, bringing a higher calibre of player to the Stadium of Light in January. But the summer window's damage has already been done.
While Younes Kaboul has shown glimpses of improvement, Sebastian Coates looked a lost cause at Sunderland from his very first game since signing permanently. He has since been loaned out but his transfer represents a series of signings - year in, year out - that have gradually made the Black Cats worse and worse.
Florian Thauvin - Newcastle United
Like Sunderland, Newcastle have looked to put things right during the January transfer window. And their summer window produced a lot of good, too. Georginio Wijnaldum has been one of the better signings across the whole of the Premier League.
But then there was Florian Thauvin. As with Coates, the Frenchman has already been loaned out and the money spend on the 23-year-old is indicative of Newcastle's wastefulness - and poor scouting - over the last few years.
If the likes of Andros Townsend and Jonjo Shelvey can keep the Magpies up, Newcastle might be forgiven for splurging on the likes of Thauvin, Remy Cabella and more. The memory of such poor deals will always linger, however...