Former Chelsea striker Diego Costa is currently in talks to join Rayo Vallecano, who face Manchester United in a pre-season friendly on Sunday.
The striker is currently a free agent after terminating his contract with Atletico Mineiro at the beginning of the year.
The 33-year-old netted four times in 19 appearances, as the club won a domestic double last season.
The notoriously spiky Costa scored 52 Premier League goals in 89 appearances for Chelsea from 2014-2017, spearheading their title triumphs in 2015 and 2017 before falling out with then boss Antonio Conte and returning to Atletico Madrid.