The Gloucester and England star suffered the undisplaced fracture in the second half of Gloucester's 19-12 defeat at Kingston Park and faces a minimum of 12 weeks' recovery time.
"An injury of this severity to one of our key individuals at this stage of the season is obviously a serious blow because Mike possesses all the characteristics you require during the play-offs," head coach Dean Ryan told www.gloucesterrugby.co.uk
"He has big-game experience, natural leadership qualities and knows what it takes to win these one-off matches and we will miss his contribution."
Gloucester can also confirm that Karl Pryce faces a lengthy spell on the sidelines. The former rugby league winger re-fractured a bone in his left foot during his Guinness Premiership debut against Northampton last month and has had a pin inserted.
The 20-year-old will now focus on rehabilitation over the summer with a view to returning to first team action at the start of next season.
"We wish Mike and Karl all the very best in their recovery processes and will be right behind them," added Ryan.
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