Japanese star Kei Nishikori announced on Tuesday that he underwent arthroscopic left hip surgery, which will keep him about for “about six months”.

“After trying several different rehab options I have decided (together with my medical team) to have arthroscopic hip surgery this week,” Nishikori wrote on Twitter. “I will work as hard as I can and the goal is to be back in about 6 months. Thank you for all your support and look forward to seeing you on the tour again soon.”

Nishikori, who is currently No. 46 in the ATP Rankings, has not competed since the BNP Paribas Open in Indian Wells last October.

The 32-year-old has climbed as high as World No. 4, lifted 12 ATP Tour trophies and competed in the Nitto ATP Finals four times.