It was the visitors who threatened to take this cup tie by storm, taking the lead twice before City level pegged.
Drawing level at 3-3 the game flowed into extra-time and the home side snatched victory with just two minutes remaining when Bryne (118) finished off a penalty to send the Foxes through to the Quarter-Finals.
They will now face the Blades at the Walkers Stadium this Saturday, 26th February 2011 and will kick-off at 7:00pm.
:: Quarter-Finals Round Draw ::
- Liverpool vs. Manchester United
- Aston Villa vs. Middlesbrough
- Leicester City vs. Sheffield United
- Chelsea vs. Watford