The 31-year-old, who can play at centre-back or left-back, has joined the Championship club after falling out of the favour at the Britannia Stadium during 2011-12
Stoke City defender Danny Collins has joined Nottingham Forest for an undisclosed fee after signing a three-year contract.
Boss Sean O'Driscoll had already affirmed his desire to bring the 31-year-old to the City Ground and the centre-back has since flown back to England from the Potters' pre-season tour of the USA in order to put pen to paper.
Collins joined Stoke from Sunderland in 2009 and made 60 appearances for the club during a three-year spell. However, he barely featured in manager Tony Pulis' plans last year, spending time on loan at Ipswich Town before helping West Ham earn promotion to the Premier League.
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Forest will be hopeful that he can repeat that feat under O'Driscoll and the club's hierarchy were eager to express their delight at his capture.
Chairman Omar Al Hasawi stated: "We are sure he will prove to be an excellent addition to the squad Sean O'Driscoll is assembling for the challenges that lie ahead."