Albion signed Jake Livermore from Hull City for an undisclosed fee in January 2017.
He made his Baggies debut just 24 hours later as Tony Pulis' men recorded a 2-0 win over Sunderland at The Hawthorns.
Born in Enfield in 1989 Livermore joined local club Tottenham Hotspur as a 16-year-old in 2006.
Livermore returned from a successful loan spell at Peterborough United to make his Spurs debut as a late substitute in their 2-1 win at Stoke City in March 2010.
His form with Spurs earned him a call-up to Roy Hodgson’s England squad for the friendly against Italy in August 2012 in Bern, Switzerland. Livermore featured as a 69th-minute substitute as the Three Lions recorded a 2-1 victory.
The 27-year-old made 58 appearances in six years as a professional at White Hart Lane – during which time he was loaned to seven clubs - before joining Hull City for a then club-record fee in 2014.
The versatile midfielder suffered FA Cup final disappointment in 2014 when the Tigers were beaten 3-2 by Arsenal. In reaching the final Hull were entered in the following season’s Europa League but fell to a First Playoff Round defeat by Lokeren of Belgium.
Livermore featured on 37 occasions as Hull were promoted back to the top flight, via the play-offs, last term.
He has been ever-present for the Humberside club this season, playing as both a centre-half and a central midfielder.
The 6ft midfielder, who has also played as a central defender for the Tigers, arrives at The Hawthorns with 128 Premier League appearances under his belt.