After Sheffield United knocked Reading out of the competition, 2-1 after extra time, the Premier League meeting with the Blades that was scheduled for Sunday 22 March has now definitely been postponed.
With the FA Cup quarter-final ties due to be played around that weekend, United will also be in action if we manage to progress past Derby at Pride Park.
The draw for the last eight will be held at Hillsborough after the game between Sheffield Wednesday and Manchester City tonight (Wednesday).
Arsenal, Chelsea, Newcastle United and Sheffield United are already through.