Mathew Ryan joined on a five-year deal from Valencia in the summer of 2017, for a then club-record transfer fee.
Having played for Blacktown City and Central Coast Mariners in Australia between 2009 and 2013, Ryan moved to Europe, signing for Club Brugge where he made more than 100 appearances for the Belgian Pro League team.
After winning the Belgian Cup in 2015 and Belgian Pro League Goalkeeper of the Year in both 2014 and 2015, the shot-stopper joined Valencia in 2015 and signed a six-year deal, keeping a clean sheet on his league debut against Rayo Vallecano.
The Sydney-born goalkeeper had a loan spell with Belgian side KRC Genk towards the end of the 2016/17 season, before joining up with Australia for the Confederations Cup.
Ryan made his international debut for Australia in 2012, and played all three matches in the 2014 World Cup in Brazil, before winning the AFC Asian Cup with the Socceroos in 2015.
He made his Seagulls debut in their opening Premier League fixture against Manchester City at the Amex, and went on to play every minute of top-flight football for the club during the 2017/18 campaign.
The Australian continued his fine form throughout the 2018/19 season, and was named the PFA Bristol Street Motors Player of the Month for October.
He also represented his country at the 2019 Asian Cup, where Australia reached the quarter finals, losing 1-0 to the United Arab Emirates.
The 28-year-old continued as first choice goalkeeper under Graham Potter following on from Chris Hughton's departure, keeping nine clean sheets in 38 league appearances in the 2019/20 campaign.
Having made 11 appearances in the first half of the 2020/21 Premier League campaign, Ryan joined Arsenal on loan for the remainder of the season, making three appearances for the Gunners.
Albion's transfer window in full
We take a look at all the deals after the transfer window closed on Monday.
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