The 27-year-old, who withdrew from from the Three Lions' World Cup qualifying double-header against San Marino and Montenegro, has not played for the Blues since damaging his meniscus against West Ham on March 17.
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"He had an operation," Benitez said. "We did it very quickly on the Saturday of the Southampton game [on March 30]."
The former Aston Villa and Bolton centre-back has made twenty-four appearances in the Premier League this campaign and Benitez will be hoping for a speedy recovery with fellow defender Ryan Bertrand recently joining Cahill and Ashley Cole on the treatment table.