Leganes will welcome a tidy windfall from Thomas Partey's move to Arsenal.
The Gunners met the €50m buyout clause in the midfielder's contract to prise him away from Atletico Madrid yesterday.
And as part of the deal, the Ghanaian's former club Leganes will be due a cool €5m courtesy of a sell-on clause.
Relegated from the Primera Liga last season, Leganes have enjoyed a boost to their coffers this year.
Along with Partey's windfall, they also made over €40m from the sales of Martin Braithwaite and Youssef En-Nesyri to Barcelona and Sevilla respectively.