Alexander Zverev is suspected to have suffered several torn ligaments during his French Open semi-final against Rafael Nadal on Friday.
The world number three’s hopes of winning a first grand slam title at Roland Garros this year were ended when he rolled his ankle late in the second set on Court Philippe-Chatrier.
Zverev was taken off the court in a wheelchair after his tournament came to a painful end in Paris.
The German will surely miss Wimbledon as he awaits confirmation of the extent of the damage he sustained.
He posted on Instagram: “Hey guys! I am now on my way back home. Based on the first medical checks, it looks like I have torn several lateral ligaments in my right foot.
“I will be flying to Germany on Monday to make further examinations and to determine the best and quickest way for me to recover.
“I want to thank everyone all over the world for the kind messages that I have received since yesterday. Your support means a lot to me right now!
“I will try to keep you updated as much as possible on further developments. See you next time @rolandgarros.”
Nadal will attempt to win a record-extending 14th French Open title when he faces Casper Ruud on Sunday.