Roger Federer will be out of action for up to a month after undergoing knee surgery in Switzerland.
The 17-time grand slam champion suffered a torn meniscus the day after his Australian Open run ended in the semi-finals, according to his agent at TEAM8 Tony Godsick.
Federer has withdrawn from the World Tennis Tournament in Rotterdam from February 8-21 and the Dubai event from February 22.
“I am so disappointed to have to miss Rotterdam and Dubai as they are two of my favourite tournaments on the ATP World Tour,” said Federer, who is the reigning champion in Dubai having won the title last March for the seventh time.
“While this is an unfortunate setback, I feel grateful that up until now I have remained mostly healthy throughout my career,” the 34-year-old Swiss added.
“My doctors have ensured me that the (arthroscopic) surgery was a success and, with proper rehabilitation, I will be able to return to the tour soon.”
The world No.3 has won two Rotterdam trophies among his 88 career titles.