Worst transfers of the window, ranked: From Cunha to Isak, 13 big moves that might fail

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Martín Zubimendi, defensive midfielder, Real Sociedad to Arsenal

-Age: 26
-Fee: €70 million
-Market value (per Transfermarkt): €60 million
-Projected negative differential between fee and value in a year: 16.7%

Last summer, I wrote about a simple transfer projection system that NFL analyst Kevin Cole helped me create.

Gerson, central midfielder, Flamengo to Zenit Saint Petersburg

-Age: 28
-Fee: €25 million
-Market value: €25 million
-Projected negative differential: 17%

There are two Zenit players on Carlo Ancelotti's most recent Brazil roster.

Mateo Retegui, forward, Atalanta to Al Qadsiah

-Age: 26
-Fee: €68.25 million
-Market value: €45 million
-Projected negative differential: 30.98%

Before last season, his first with Atalanta, Retegui had never scored more than 13 non-penalty goals in a season -- in any professional league, in any country -- and he'd never generated more than two assists.

Yoane Wissa, forward, Brentford to Newcastle

-Age: 28
-Fee: €57.7 million
-Market value: €32 million
-Projected negative differential: 45.27%

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Hutchison slams Isak and Wissa's 'lack of professionalism'

Don Hutchison discusses Alexander Isak and Yoane Wissa's lack of professionalism by refusing to play and train for their respective clubs when trying to move clubs.

This feels like a good example of why (A) you don't let your best player leave on the last day of the window, and (B) you don't pay for past performance.

The whole Isak saga felt pretty pointless in the end.

Son Heung-Min, winger, Tottenham to LAFC

-Age: 33
-Fee: €22 million
-Market value: €20 million
-Projected negative differential: 48.2%

This is the highest transfer fee ever paid by an MLS club, and it's the third-highest fee ever paid by any club for a player 33 or older.

Nick Woltemade, forward, Stuttgart to Newcastle

-Age: 23
-Fee: €85 million
-Market value: €30 million
-Projected negative differential: 48.5%

Let's say there was this really tall striker with great feet for a player his size.