Murray turned his ankle in the latter stages of a third-round defeat by Tomas Machac on Sunday and continued playing, seemingly untroubled by the injury.
But, following a scan, the Briton revealed he had suffered a full rupture of his anterior talofibular ligament and a near-full-thickness rupture of his calcaneofibular ligament.
Murray was set to see an ankle specialist on his return to the UK this week to determine his steps to recovery, which is expected to take anything from six to 12 weeks.
The 36-year-old has declared a desire to play the French Open and a full grasscourt calendar, including Wimbledon, where he is a two-time champion, with the Olympics acting as a possible swansong to his illustrious career. He has already made it clear he does not seem himself playing much beyond this summer.
Announcing the news on social media last night, he wrote: “Yesterday, towards the end of my match in Miami, I suffered a full rupture of my ATFL and near full thickness rupture of my CFL.
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