The 26-year-old sustained the injury in the first half of the 2-0 win over Crystal Palace last weekend.
West Brom’s joint-assistant head coach Keith Downing told the club’s official website: “There is a big chunk of time now for him to get it right.
“But we’re disappointed because Billy’s played well and he’s been one of our best players.”
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.