Lille midfielder Nabil Bentaleb has been taken to hospital in France after falling ill.
The Algeria international, 29, who started his senior career at Tottenham in 2013, joined Lille from Angers last year, making 34 appearances.
Bentaleb was "immediately taken care of and sent for hospitalisation" Lille said in a statement.
The club added: "LOSC [Lille] accompanies Nabil as closely as possible during this ordeal and gives him all its support."
Bentaleb spent three years at Spurs, making 46 Premier League appearances, before joining Schalke in 2017.
"We’re sending you all our love and best wishes, Nabil.