Mark Schwarzer joined on a free transfer on 9 July 2013.
The Australian international goalkeeper signed a one-year contract that will keep him with the club until next summer's World Cup in Brazil, for which he helped his country seal qualification in June.
'It's a phenomenal club,' he said upon signing. 'It's one of the biggest and best clubs in the world, and it's an honour to sign for Chelsea. I didn't take much convincing to come here.'
Schwarzer, 40, brings with him a wealth of experience after more than 15 years in England with Bradford City, Middlesbrough and most recently Fulham, and last season became the first overseas player to have made 500 Premier League appearances.
Born in Sydney, Schwarzer began his career with Marconi Stallions before moving to Europe with German side Dynamo Dresden in 1994, which was followed by a short spell in the Bundesliga with Kaiserslautern.
A move to England followed in 1996, with Bradford City the platform from which Schwarzer signed for Middlesbrough, going on to play more than 400 times in 11 years, lifting the League Cup in 2003 and appearing in the 2006 UEFA Cup final against Sevilla.
In 2008, he moved south to west London with Fulham, spending five years at Craven Cottage, where he made 220 appearances.
Schwarzer made his international debut in 1994, and has since represented Australia 108 times, including at the 2006 and 2010 World Cups.