Sunderland have banked an extra £350,000 from last summer’s sale of midfielder Alfred N’Diaye.
N’Diaye moved to Real Betis last August in a deal potentially worth more than £1m after he had enjoyed a six-month loan stint with the Spanish side.
Betis had just been relegated to the Spanish Second Division when they made N’Diaye their top transfer target and they spent the bulk of their summer budget on the Senegalese international.
But Betis’ down-payment on N’Diaye was just £350,000, with a second instalment of the same figure due this summer.
There was also an additional £350,000 payment agreed between the two clubs, if Betis were able to earn promotion back to La Liga.
Betis will now have to shell out that final payment after comfortably winning the Second Division title this season.
Sunderland have still made a hefty loss on N’Diaye after shelling out more than £3m to land the powerful midfielder from Turkish side Bursaspor in January 2013.
But the 25-year-old was one of several players considered surplus to requirements that sporting director Lee Congerton was forced to offload last summer.
That continued during the season with the departures of Roberto De Fanti flops Cabral and Modibo Diakite.
And there are likely to be further departures this summer, with El-Hadji Ba, Charis Mavrias and Valentin Roberge all earmarked for the exit door.
All finished the season out on loan and none are thought to have a future on Wearside.