Former Manchester United defender Axel Tuanzebe is suing the club for allegedly providing irresponsible medical advice.
The 27-year-old, who joined Burnley earlier this month, filed a civil claim against Manchester United at the High Court last week.
It covers a period beginning in July 2022 and involves an unknown injury. It is regarded as a high-value claim, estimated to be worth more than £1 million.
Tuanzebe was sidelined for 195 days during his final season with the club before being loaned to Stoke in January 2023, where he made only five appearances.
He joined the club at the age of eight, making his debut in 2017, and played 37 games until leaving in the summer of 2023 to join Ipswich as a free agent that September.
The right-back captained United at every level and his final appearance for the club was in the 2021 Europa League final loss to Villarreal, where he scored in the shootout as they lost 11-10 on penalties.
The former England Under-21 international – who now represents DR Congo – also had three spells on loan at Aston Villa, while he also spent time at Napoli in 2022.
Tuanzebe’s lawyers, Simons Muirhead Burton, and United both declined to comment when approached by BBC Sport.