Real Sociedad will receive a huge financial windfall from Antoine Griezmann's move to Barcelona which could rise to €32m.
It's not the first time that a player's first club has cashed in on a player's future transfers by adding sell-on clauses to their contracts.
Queens Park Rangers earned €10m from a 20% sell-on clause when Raheem Sterling switched from Liverpool to Manchester City in a €50m deal. Chelsea pocketed €12m when Kevin De Bruyne’s transfer to Manchester City from Wolfsburg in the same transfer window.
Southampton were big losers, however, when Gareth Bale made a then-world record £86m switch from Tottenham Hotspur to Real Madrid in 2013. They would have landed roughly £20m from the deal but their financial constraints at the time meant they had to waive the figure and settle for a nominal lump sum of £3m from Tottenham.
Back to the present, and Real Sociedad's smart and savvy sell-on clause in Griezmann's contract means that they have some cash to spend this summer. The €24m fee accruing to them could rise to €32m and they'll be keen to reinvest that in their squad.
New Real Sociedad manager has already added Christian Portu from relegated Girona in a €10m deal. He's also picked up teenage striker Alexander Isak from Borussia Dortmund. Highly-rated Danish playmaker Martin Ødegaard, on-loan from Real Madrid, is also an interesting option for them ahead of the 2019/2020 season.