Nice introduced free agent signing Ross Barkley, who was released by Chelsea, to their fans on Sunday before their Ligue 1 home game against neighbours Monaco.
Barkley has played 33 times for England and was part of the squad for the 2014 World Cup.
He struggled after moving from Everton to Chelsea for £15 million ($17 million) in 2018. He appeared in 58 Premier League games in five seasons and was also sent out on loan to Aston Villa.
He left Chelsea by mutual consent at the end of August.
Barkley is the 12th recruit for Nice this summer.
The club is owned by British company Ineos which is run by Englishman Jim Ratcliffe.
Three of the summer signings Nicolas Pepe, Joe Bryan, Mads Bech Sorensen, are on loan from English clubs. Danish goalkeeper Kasper Schmeichel, was bought from Leicester, while Wales midfielder Aaron Ramsey arrived after his Juventus contract was terminated in July.
Nice finished fifth last season but have made a sluggish start to the new campaign. Barkley will not be eligible when they start their Europa Conference League campaign against Cologne on Thursday.