Albion are delighted to confirm the signing of Krystian Bielik from Birmingham City for an undisclosed fee.
The 27-year-old defender, who can also play in midfield, joins having penned a three-year contract at The Hawthorns.
Bielik has 129 Sky Bet Championship appearances to his name, alongside 11 international caps for Poland.
Sporting Director Andrew Nestor said: "Krystian is a seasoned and proven player and, at 27, is in his prime years for a defender. He knows English football well, is experienced and has proven himself as a leader.
“Krystian’s arrival adds to the quality we have already invested in this summer to transform our centre back options. We feel George Campbell has huge potential to develop at 24 – as does Caleb Taylor at just 22 – and we have already benefitted from the technical and leadership qualities of Nat Phillips.
“There will be strong competition for places in our starting XI – and we believe that will bring out the very best in the players vying to start.”
Bielik added: “Albion are a massive club. When I found out I could play for this team, I was really happy.
“The Championship is one of the hardest leagues, you have to be ready for everything that’s coming. You have to be prepared, you have to be fit, you have to be strong physically and mentally.
“It’s nothing new for me, I’ve done it many times now, and I honestly can’t wait. I hope we can be very successful this season.”
