Paris Saint-Germain have confirmed full-back Layvin Kurzawa has undergone back surgery.
The 26-year-old had an operation on a herniated disc at the Pitie-Salpetriere Hospital after complaining of pain during training.
"Paris Saint-Germain defender Layvin Kurzawa underwent surgery on a lumbar herniated disc on Wednesday September 12," the club said in a statement.
"The surgery was successfully conducted by Professor Pascal-Mousselard from the orthopaedic department of the Pitie-Salpetriere Hospital.
"The length of his convalescence will be established in light of the post-surgery evolution of the injury."
Kurzawa made 20 appearances in Ligue 1 last season but is yet to play under head coach Thomas Tuchel, who was appointed in May.