Claudio Yacob has signed a new two-year contract with West Brom, the club announced on Thursday.
The 29-year-old's deal had been set to expire at the end of this season, but he has now tied his future to the club until 2018, with an option for a further 12 months.
"I'm pleased to sign a new deal with the club," Yacob told the club's website.
"It wasn't a difficult decision because everyone working at the club, the fans and the players have all made me feel very comfortable since I've been here.
Look who has been handed a new contract!
- West Bromwich Albion (@WBA) September 29, 2016
"Hopefully I can continue to play in the team. I'm happy."
West Brom boss Tony Pulis added: "Claudio is a great professional and players like him are vital. I'm happy we've tied him down to a new deal."
The Argentine joined West Brom from Racing Club in 2012 and has made 129 appearances.