International call-ups put paid to Bramall Lane clash.
First team quartet David Edgar, Che Adams, Callum McFadzean and Louis Reed A new date is expected to be confirmed early next week.
That means that the U's will now have a free weekend between the midweek cup game against Northampton on September 1st and the weekend trip to Chesterfield on September 12th.
The Blades have since lodged that request, meaning the game on Saturday September 5th has been called off.
have been called up for their respective countries, triggering the Football Association regulations that would permit a request for a postponement.