The Argentina international, who has three caps to his name, is believed to have the option of a fourth year in his Albion deal.
The 25-year-old was available on a free transfer after his contract at Argentine side Racing Club expired.
Yacob had already flown out to Malmo to join the Baggies' pre-season training camp but has wasted no time in completing a permanent move to the Black Country.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.
The adidas Nitrocharge is the most talked about new cleat in years. It was released on May 15 and will take your pitch by storm.
Borussia Dortmund hears Wembley Calling and are headed to London for the Champions League final.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
One of the top soccer cleats for control the Nike CTR360 will not let you down on the field in tight spaces.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.