The versatile defender has signed a two-and-a-half year deal with The Baggies, but will unfortunately not be eligible to make his debut in the Midlands derby against Aston Villa on Wednesday.
Roy Hodgson was delighted to welcome Ridgewell to The Hawthorns, and revealed that his side have been after the 27-year-old for some time.
“Liam is a very experienced defender and has the added benefit of being left-sided. We do not have many of those defenders at the club,” the manager told Sky Sports.
“He can also play in two positions (left-back and centre-back) and he is used to playing in teams under pressure to get results to stay in the league.
“We hope we won’t be one of those teams under pressure but, if we are, it is good to have someone of that experience.
“Liam was a transfer target last summer and since the start of this January but negotiations have been long and arduous which is often the case,” he concluded.
By Gareth McKnight