The 37-year-old has agreed terms with the newly-promoted club and penned a one-year deal, with the option extending to a second season, following 15 years with the Trotters
West Ham have completed the signing of Bolton goalkeeper Jussi Jaaskelainen on a free transfer.
The 37-year-old has penned a one-year contract with the newly-promoted side, with an option for the Hammers to extend to a second year.
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The former Finland international has made 500 appearences in English football since joining Bolton in 1997, and is set to be in competition with fellow new arrival Stephen Henderson, while the future of current number one Robert Green remains uncertain.
Jaaskelainen told the club’s official website: "I'm delighted to be joining West Ham United. After spending 15 years in Bolton it's a great new challenge and I'm really looking forward to it.
"Everything has happened really quickly. When the opportunity was offered to come to West Ham I didn't think twice and I just told my agent to sort it out as quickly as possible.
"I appreciate Bolton giving me permission to speak to West Ham before my contract was up and for the efforts the Chairman made in trying to get me to stay.
"I would like to thank the fans for all their support over the years and I wish the players and, in particular, Owen Coyle all the best in gaining promotion at the first attempt."
Jaaskelainen worked with West Ham boss Sam Allardyce at Bolton, helping them gain promotion to the Premier League via the play-offs in 2001.
The goalkeeper was also an integral member of the squad which helped to establish the club’s top-flight status, as well as reaching the knock-out stages of the Uefa Cup in 2006.