Cucurella left the Blaugrana for Getafe on a permanent deal last summer after the La Liga outfit triggered the buy option on his loan contract.
The deal was initially agreed for €6 million with a 40 percent sell-on clause. Getafe later paid an additional €4m to reduce the sell-on percentage to 10.
Barcelona were recently permitted to register Memphis Depay, Emerson Royal and Eric Garcia after Gerard Pique accepted a significant pay cut.
Jordi Alba has followed his compatriot in doing so. Talks are underway with club captains Sergio Busquets and Sergi Roberto over similar salary reductions.
There is still work to be done to bring the wage bill within the new La Liga salary cap, but the small sum received from Cucurella’s move to Brighton will help.
The Catalan giants have yet to be granted permission by La Liga to register Sergio Aguero, who is out for around two months with a calf injury sustained in training.
The club are hoping to offload some of their fringe players in time to register him. Miralem Pjanic appears on the move, but Samuel Umtiti has refused to leave the club.
Stats from Transfermarkt.com