The 32-year-old centre-back will miss Leicester City's start to the new Premier League campaign after being ruled out for 2 months.
Manager Craig Shakespeare confirmed 'He's had an ankle operation, which thankfully was really successful, we've had some more positive news on it and I'm expecting six to eight weeks'.
'It's unfortunate for Robert but we thought the diagnosis might be worse'.
The Foxes begin their pre-season against West Bromwich Albion in the Premier League Asia Trophy in Hong Kong on July 19.