Newcastle have confirmed Florian Lejeune has undergone successful knee surgery to repair an anterior cruciate ligament tear.
The 27 year defender old posted a picture on social media with the caption: "My knee operation was a success. Now it's time to rest and recover."
"I was speaking with Florian before and after his operation," Newcastle boss Rafael Benitez told the club's website.
"The doctor says it has gone well and he seems to be in good spirits. I join everybody at the club in wishing him a speedy recovery."