The 27-year-old defender becomes the Eagles’ third summer signing after Andros Townsend and Steve Mandanda arrived last week.

Moments after putting pen to paper on his Eagles contract, Tomkins said: “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”.

The club’s Chairman Steve Parish also commented, saying: “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.”