Erling Haaland reportedly could cost Barcelona over €100m.
Even if there's a release clause of €75m in place, the commission fees and bonuses would likely increase the total cost to this figure.
There are just 12 players who signed for their new clubs for €100m+. It's fair to say that few of them have actually worked out.
Here is the full list.
2. Kylian Mbappe - €145m (Monaco to PSG)
3. Ousmane Dembele - €140m (Borussia Dortmund to Barcelona)
4. Philippe Coutinho - €135m (Liverpool to Barcelona)
5. Joao Felix - €127.20m (Benfica to Atletico Madrid)
6. Antoine Griezmann - €120m (Atletico Madrid to Barcelona)
7. Jack Grealish - €117.5m (Aston Villa to Manchester City)
8. Cristiano Ronaldo - €117m (Real Madrid to Juventus)
9. Eden Hazard - €115m (Chelsea to Real Madrid)
10. Romelu Lukaku - €113m (Inter Milan to Chelsea)
11. Paul Pogba - €105m (Juventus to Manchester United)
12. Gareth Bale - €101m (Tottenham Hotspur to Real Madrid)
Now let's divide all of these transfers into three groups: successful, not bad and poor.
Successful: Kylian Mbappe.
Not bad: Neymar, Antoine Griezmann, Cristiano Ronaldo, Gareth Bale.
Poor: Ousmane Dembele, Philippe Coutinho, Joao Felix, Eden Hazard, Paul Pogba.
It's too early to judge the Grealish and Lukaku moves but they are far from being successful as things stand.
The only €100m+ move that actually paid off is Kylian Mbappe's switch from Monaco to PSG. The Parisians received 152 goals and over 60 assists in 3.5 years in exchange for €145m. Sounds like a successful deal.
Higher hopes were pinned on players like Cristiano Ronaldo, Neymar and Gareth Bale, which is why we can't brand them successful.
Most of the players who moved for €100m+ are flops. Given that there are three Barca players on this list, the club should think carefully of whether to spend such a hefty fee on Haaland.