Veteran Brown was the subject to a joint bid of £12m by Black Cats boss Steve Bruce, along with John O’Shea and Darron Gibson. United accepted the bid last month.
BBC Sport said:
“Brown, 31, signed his first professional contract at Old Trafford in 1996 and has made 361 appearances for Sir Alex Ferguson’s side.
The England international has travelled to Wearside and could finalise the move on Wednesday.
Brown, who made his United debut in 1998, has won two Champions League titles, five Premier League winners’ medals, two FA Cups and two League Cups with the Red Devils.
However, the Da Silva twins, Fabio and Rafael, are above him in the pecking order to play at right-back and the arrival of Phil Jones alongside central defenders Rio Ferdinand, Nemanja Vidic and Chris Smalling suggests that opportunities to play first-team football next season could be limited.
Brown could be joined at the Stadium of Light by O’Shea, 30, but progress in a deal for the Republic of Ireland international has been stalled as his wife has given birth since Sunderland’s bid was accepted.
The future of Gibson, 23, is less clear, with Newcastle also showing an interest.”
It’s with a sad acceptence that we see Brown leave for pastures new. A true warrior for United, and the one who played the ball in for Ronaldo for his goal in the 2008 Champions League final – perhaps his best season in the red shirt. He was immense that year, and often when he had a run in the side he was one of our most consistent performers.
A fond farewell, and a thank you – with best wishes from reds far and wide.