Diangana spent last season on loan at the Hawthorns as Slaven Bilic’s side sealed their promotion to the Premier League and he returned on a five-year contract.
The 22-year-old has scored eight goals in 30 appearances for West Brom and the England Under-21 international is delighted to make his mark in the top flight. He said: “I know I can bring more to the game and to the team. I’m still young and last year was like my first season in senior football. I feel like I’m only going to get better.
“And I believe in the style of football we play under Slaven. I think we’ll be ready for the challenge ahead because if you can’t keep the ball in the Premier League it will be difficult.
“We have the quality to do that and be competitive and if we pursue the ambition to do well and not just survive, we can exceed the expectations of some people.”