Wes Brown completed his switch to Wearside from champions Manchester United, the fee is thought to be around £1m, as the 31 year old sealed a 4 year deal with Sunderland.
John O'Shea was the second player to make the move from Manchester United this window, as he too signed a 4 year deal with the club. The fee is undisclosed, however it is thought to be around £3m.
David Vaughan became Steve Bruce's 9th senior summer signing, as he arrived from recently relegated Blackpool on a free, the 28 year old signed the dotted line on a 3 year deal.
James McLean became Sunderland's 10th Summer signing as the left footed winger made the move from Derry City in Northern Ireland, the fee is thought to be around £350k.
Nicklas Bendtner was the last addition to the squad following his transfer deadline day loan move from Arsenal. The Dane joins Sunderland until the end of the season.
Wayne Bridge was the first of Martin O'Neill's signings as he made the loan switch from The Etihad stadium to Sunderland.
Sotiris Kyrgiakos was O'Neill's second and final signing of the window as the big greek centre-half moved on loan from Wolfsburg.