"The exams that I did today have revealed a chondropathy of my left patella and a tear in my left achilles heel," Monfils said.

"I will start tomorrow a rehabilitation program and will do all it takes to recover as soon as possible."

The French number two seemed to struggle last week in Indian Wells, where he went down to Austrian Dominic Thiem in the last 16, and he was not entered for Miami, which starts Tuesday.