Stan Wawrinka will be out of action 'for a few weeks' after he confirmed he had undergone minor foot surgery.
The three-time Grand Slam winner recently withdrew from Miami, although there was no real hint an injury was behind the decision.
However, he says the problems have existed 'for a while' and that prompted his decision to have the operation.
“Hey guys, just wanted to update you," Wawrinka wrote on Instagram.
"After having some problems in my left foot for a while, I have decided to do a small procedure on it.
"Everything went well. I will be out for a few weeks but can’t wait to start practicing again soon.”
The injury means Wawrinka has pulled out of three tournaments but should be back in time for the French Open.
Before the surgery, he had added his name the entry lists for Monte-Carlo, Marbella, and Belgrade, but now will not be able to play in any of them.
Wawrinka only reached the second round of the Australian Open last month, although he did have match points in the defat to Marton Fucsovics, so it is unclear whether the injury was a factor in that defeat.
For more exclusive content from Tennisbuzz, including news, features, trivia, promotions and more, please be sure to sign up for our newsletter below or via our home page.
Why not test your tennis knowledge by tackling one of our fiendish quizzes too?