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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.