Portsmouth have signed Charlton defender Hermann Hreidarsson on a two-year deal, manager Harry Redknapp announced Friday.
The 32-year-old Icelander exercised a clause in his contract which allowed him to leave The Valley on a free transfer if the Addicks were relegated.
He moves to Fratton Park two days after Redknapp signed Manchester City defender Sylvain Distin on a three-year deal.
Redknapp told the club's website: "I've always liked Hermann. I tried to buy him before and I'm delighted he's now here at Portsmouth.
"He's got great experience at Premier League level, he's big, quick, very good in the air and a good competitor. He can play at left-back and in the centre of defence so he gives us plenty of options."
Hreidarsson revealed: "I was very close to joining a few years ago, but now this club is a very different one with big ambitions. I'm very happy to be here and I'm sure the club will be pushing for a place in Europe next season.
"I've always enjoyed the atmosphere at Fratton Park but I'd much rather the fans were on my side than against me. I'm looking forward to playing in front of them."