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.”
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?