Yacob, 28, joined West Brom from Racing Club de Avellaneda in his native Argentina back in the summer of 2012, and he's established himself as a key player at The Hawthorns ever since.
Few players successfully make the jump from South American football to the Premier League, but Yacob has certainly done that, racking up over 100 appearances for the Baggies in almost four years at the club.
The Argentine midfielder has had his critics over the years, but he's been an important player under a number of different managers, underlining his importance to West Brom.
Now though, The Mirror report that Spanish side Sevilla - who have won the Europa League two years in a row - are plotting a summer move to sign Yacob.
It's stated that, with Sevilla set to lose Ever Banega to Inter Milan at the end of the season, the Andalusian side are looking for Yacob to replace his fellow Argentine midfielder, and are ready to offer £3.5m in a shock move this summer.
With Yacob's contract set to expire in the summer of 2017, West Brom may be tempted to at least negotiate a deal this summer, if Sevilla do indeed mount a surprise bid to sign Yacob.
Would you let Yacob leave this summer?