Atletico Madrid could be facing a headache over Kieran Trippier's future due to the Brexit laws being introduced in 2021.
Trippier joined the Spanish side from Tottenham in 2019 on a three-year deal reported to be just over £20million.
However, despite having two more years left on his contract, Atletico are on course for a Brexit headache over the defender, according to Mundo Deportivo.
The UK is set to formally complete their exit from the European Union at the start of 2021, which will see Trippier become a non-EU player.
There is currently there is no deal to guarantee Trippier’s EU working rights in Spain, as he would become the fourth non-EU player in Diego Simeone’s Atletico squad.
La Liga rules state a club cannot name more than three non-EU players in a match day squad and Simeone already has Santiago Arias, Felipe Monteiro and Renan Lodi in his set-up.
Arias, who is also a right-back, has been linked with an exit from the club after falling out of favour with Trippier and Sime Vrsaljko for competition.
The club are also exploring the option of obtaining a Portuguese passport for Felipe Monteiro, who played three seasons with Porto.