And with another day of sales to go, that figure is expected to rise further.
Sunderland provided the update at teatime on Thursday.
Meanwhile, earlier in the day, Sheffield Wednesday confirmed the second leg of their League One play-off semi-final against Sunderland at Hillsborough has sold out. Sunderland had already sold out their 2,000-strong allocation for the game.
The strongest Sunderland XI Alex Neil could pick right now - and the clear transfer priorities it shows
Sunderland, Middlesbrough and Sheffield United 'interested' in Everton defender plus Tottenham face Jack Clarke decision
Contract details revealed as Sunderland star Anthony Patterson signs new deal in massive boost
15 eye-catching transfers made West Brom, Stoke, Middlesbrough, Norwich and Sunderland's Championship rivals
Why Premier League clubs could be more reluctant to sanction loan signings as Sunderland monitor Everton and Tottenham situations
And the Owls have now announced all home tickets have also sold out.
The play-off game is to be played in front of a record-breaking crowd over the two games with more than 42,000 fans heading to the Stadium of Light on Friday for the first leg.
An Owls club statement read: “Next Monday’s League One play-off second leg tie against Sunderland is now completely sold out for home supporters.
"Remaining tickets went on general sale this morning and all available seats have been sold, including those in the West Stand Lower.”
It added: “Fans are advised to arrive at Hillsborough as early as possible on Monday evening to avoid unnecessary queuing as we welcome our second sell-out attendance in just over a week.”