Crystal Palace have signed defender James Tomkins from West Ham for £10m.
Tomkins, 27, has signed a five-year contract at Selhurst Park and becomes Palace manager Alan Pardew's third signing of the summer following the acquisitions of winger Andros Townsend from Newcastle and goalkeeper Steve Mandanda from Marseille.
"I am really excited to be joining Crystal Palace, a massive club and a manager in Alan Pardew that I know well and will always be thankful for how he helped me develop in my younger days at Upton Park," he said.
Tomkins did not travel with the rest of the West Ham squad for their pre-season tour of America ahead of the transfer.
Palace chairman Steve Parish said: "I'm really pleased James has agreed to join us, he's someone Alan has always wanted to sign from his own days at West Ham. I'm sure he is destined to become a huge part of our team as we look to build on the progress the club has made over the last six years.
"It's been a really positive transfer window so far, everyone has worked really hard to make these deals happen and I think we are much stronger because of them."
Tomkins, who came through the youth ranks at West Ham, made 32 appearances for Slaven Bilic's side last season.
He featured predominantly at right-back for the Hammers during the 2015/16 campaign, scoring in the FA Cup quarter-final defeat to Manchester United.