The 30-year-old was forced off against Everton on Saturday, and will now undergo surgery on a stress fracture in his right foot, with Boaz Myhill set to step in for the BaggiesWest Brom goalkeeper Ben Foster has been sidelined for up to three months with a stress fracture in his right foot, the club have confirmed.
The 30-year-old withdrew from action in the 77th minute of Saturday's 0-0 draw with Everton, and will now require surgery.
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"There's no hiding the fact this is disappointing news as Ben is a key player for us," Clarke told the club's official website.
"He was excellent on Saturday before his injury forced him off.
"In the meantime, I’ve got two other very good goalkeepers to choose from.
"Boaz did well when he deputised for Ben last season and Luke showed on Saturday he is a more than capable goalkeeper."
The injury has also ruled Foster out of the reckoning for Roy Hodgson's England squad for the World Cup qualifies against Moldova and Ukraine in September.