The 26-year-old agreed a two-year contract with the Premier League club and becomes the Baggies' 11th new arrival since the end of last season.

"He's an Argentina international who joined Metalist for a lot of money. Unfortunately, he suffered an injury not long after the move, which held up his progress," Albion manager Alan Irvine said.

"Since then, he's shown his quality. He's adept with both feet, is a nice crosser of the ball, creates chances and also scores goals.

Blanco, who has two caps for Argentina, helped Metalist finish as runners-up in the Ukrainian top-flight in 2012-13, scoring 10 goals in 68 league appearances during his three and a half years in Kharkiv.