He has made 83 appearances since arriving at Portsmouth, and is now a regular in Fabio Capello's England squads.
Since making his England debut in November 2003, he has made 10 appearances - half of them under Capello in 2008 after almost three years out of the team.
Pompey executive chairman Peter Storrie told the club's website: "In my opinion Glen is the best right-back in the country and this sends out a strong message that top quality players want to play for this club."
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