Portsmouth defender Hermann Hreidarsson has signed a one-year contract extension, keeping him at the club until the end of the 2011/12 season.
The 36-year-old, who joined the club from Charlton in 2007, has scored eight goals in 121 games for Pompey.
Blues chief executive David Lampitt said: "We are delighted to have Hermann back for another season.
"His experience, passion and ability to lead will no doubt continue to benefit the side next season."
Hreidarsson started his career at Icelandic Premier League side IBV and went on to play for Crystal Palace, Brentford, Wimbledon, and Ipswich.
The Iceland international made 29 appearances for the Blues last season, despite spending the majority of the campaign sidelined with an Archilles tendon injury.
"Last season Hermann showed great commitment in his return from a serious injury. He embodies everything that is great about Pompey," added Lampitt.
"He's been a big part of this club for the last four years and we're delighted to have him back."