The remaining seats, however, are ones with a restricted view and not in groups. The terrace has sold out.
Manchester United are expected to sell their entire allocation of 1,678, raising the prospect of a new attendance record at Glanford Park.
The current record is 8,921 - recorded for the Iron's 2-1 Championship win over Newcastle United in October 2009.
As well as a large crowd at the match, the tie will be broadcast live in the United Kingdom on Sky Sports and across the world