The San Francisco 49ers are not expecting Michael Crabtree back from his torn Achilles until late November and are not counting on the wide receiver to make a meaningful contribution until the end of the season, a source familiar with his comeback told ESPN NFL Insider Adam Schefter.

Michael Crabtree has been sidelined since suffering an Achilles injury in May. Harry How/Getty Images

The Niners also are planning for the possibility that Crabtree might not contribute until the postseason the source told Schefter.

"It looks like he'll be ready come playoff time," the source said.

Crabtree, San Francisco's leading receiver in 2012, underwent surgery after tearing his Achilles tendon during a practice on May 21.

Niners coach Jim Harbaugh said earlier this month that he thinks Crabtree will be "game ready" by mid-November.

But more immediate receiving help could be on the way for the 49ers. Mario Manningham, recovering from a torn ACL, could play as soon as next Sunday against the Jacksonville Jaguars.