Here we take a look at their best players who arrived on a free transfer and went on to make telling contributions. We feature those signed since 2010.
1. Tomasz Kuszczak
The goalkeeper arrived from Manchester United in 2012-13. The Polish keeper made 84 appearances for Albion and left for Wolves in 2014. He's now 38 and is at Birmingham. | Getty
2. Bruno
The right back signed from Valencia in 2012-13 and went on to become a hugely popular figure on the south coast. Retired in 2019 having made a very impressive 225 appearances for the Albion. Now, 39, and a key man in Graham Potter's coaching set-up | Getty
3. Liam Rosenoir
Signed from Hull City in 2015-16 and made 44 appearances for Albion. An accomplished defender and now first team coach at Derby County. | Getty
4. Matthew Upson
The centre back and former England international arrived from Stoke City in 2013-14. He made 18 appearances on his initial loan period and another 43 follow his free transfer. Moved to Leicester in 2014 and the 41-year-old is now a respected pundit on the beeb. | Getty