The North Shields born keeper joined Sunderland at the age of 10, signing his first scholarship in 2018.
Time on Wearside
Anthony Patterson broke into the first team in the 2021-22 League One promotion campaign, nailing the number one spot and making a vital save in the Play-Off final to deny Sam Vokes.
The keeper then became a Championship regular for the Black Cats, making 136 appearances in Sunderland's three-year stint in the second tier, missing just five games.
Once again Patterson made himself a hero at Wembley, this time in the Championship play-off final. After pulling off a tremendous save to deny Kieffer Moore after just two minutes, Patterson then denied Andre Brooks with his feet to put the Blades two nil up.
After being replaced by Robin Roefs last season, Patterson spent the second half of the campaign on loan with Millwall, reuniting with Alex Neil.
The former England youth international made 169 appearances for the Black Cats, registering 51 clean sheets.
New home
The keeper will reunite with Callum Doyle and Nathan Broadhead, who both had successful loan spells on Wearside during the League One promotion season.
Patterson knows his new teammates well, having featured against the Red Dragons in the States.
Wrexham manager Phil Parkinson handed Patterson his Sunderland debut in the EFL Trophy group stage clash away to Fleetwood.
The keeper has put pen to paper on a four year deal and is likely to start in the Championship opener against rivals Cardiff. The fee is undisclosed but believed to be in the region of £8million to £10million.
Black Cats clear out
The Black Cats have seen several departures this week with a number of fringe players departing, including Leo Hjelde, Ahmed Abdullahi and Arthur Masuaku.
Abdoullah Ba could be the next to exit Wearside with a move to Peterborough United on the cards.
Regis Le Bris confirmed Timur Tutierov will be around the squad this season, with no decision yet made on defender Jenson Seelt.
The Black Cats are yet to spend this summer, with the only new arrival Thomas Meunier arriving on a free following the expiry of his contract with Lille.
Le Bris however did comment that they are being patient and looking to bring in between two to five new additions.
The re-build
Patterson's departure leaves Luke O'Nien and Trai Hume as the final two players from the League One promotion campaign.
Dennis Cirkin, Patrick Roberts and Dan Neil made up the six players who achieved the double promotion, but only two now remain.
Like Patterson, former captain Neil didn't really get the minutes to prove himself in the top flight, especially with the signing of Granit Xhaka. Neil departed on a free after a loan spell with Ipswich Town; the midfielder moved to Rangers over the summer and captained Derek McInnes' side in their Europa League qualifier on Thursday night.
Cirkin was also released at the end of the season following the end of his contract. The left-back is currently still without a club.
Roberts departed last summer, joining Championship Birmingham, initially on loan before making his move permanent in January.
Will there be a replacement?
Roefs will be the number one as expected and it is likely Melker Ellborg will be the number two, unless a potential loan deal arises and Sunderland get a replacement.
The Swedish keeper has looked shaky in pre-season, making a costly error in the defeat to Leeds United.
Since the mistake the 23-year-old hasn't featured for the Black Cats, with Roefs starting the last two games and Patterson getting a cameo against his new side Wrexham.
Simon Moore will once again be the third choice after signing an extension at the end of last season.
