Vunipola is scheduled to return in October while Saracens start their Premiership campaign against the Northampton Saints on Sept. 2.
"He's in great condition," McCall told British media. "Billy's due back some time in October, but in true Billy style he'll make it back considerably before that.
"I'll be told by the medics when we can pick him but it won't be long."
Vunipola, who has 34 England caps, sustained a serious knee injury in November but recovered in four months to play at the Six Nations tournament in March.
(Reporting by Aditi Prakash in Bengaluru; editing by Sudipto Ganguly)
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