The Black Cats were handed 2,000 tickets for the match at Hillsborough – which will take place on Monday, May 9 (7:45pm kick-off) - the minimum amount the Owls could have provided under EFL rules.
Regulations state that teams have to give at least 2,000 tickets to the away team – or 10 per cent of their capacity based on the stadium.
Sunderland have also provided just 2,000 tickets to Wednesday supporters for the first leg at Stadium of Light on Friday.
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Tickets for the match on Wearside are still on sale, with the attendance expected to rise above the 40,000 mark.
The attendance is set to be Sunderland’s biggest of the season by far, surpassing the crowd of 38,395 for the Black Cats’ 2-1 defeat against Doncaster when Jermain Defoe made his second debut for the club.