Clark leaves his job as Sports Scientist at the Madejski Stadium, despite having three years to run on his contract, to become West Ham’s new Head of Technical Support.
Pardew said to the official site “I’m absolutely overjoyed to have reacquainted myself with Niall,
“He joins West Ham United as Head of our Technical Department, where he will oversee the fitness, injury and psychology of the group.
“In my opinion, Niall is a very important signing this summer. He will enhance every part of our Club.”