All tickets - which must be collected in advance from the ticket office at Old Trafford - are free and our visitors from West Yorkshire are believed to be bringing around 1,500 away supporters across the Pennines for the fifth-round tie, which kicks off at 19:00 GMT.
With the eagerly awaited encounter also being shown live on MUTV, Treble-winner Butt is looking for the club's Academy youngsters to embrace what promises to be a special occasion.
“There’s been great rivalry with Leeds in the past but it hasn't existed in recent years with the two teams [in different divisions],” Butt told us.