The wide receiver was an integral part of the 49ers' win over the Green Bay Packers last Saturday, making nine catches for 119 yards and two touchdowns.
Falcons safety William Moore told the team's website: "He's a guy that can get down field real quick. He's a deep threat all the time. When they do their gadgets, he's a guy that can reverse the field. You've got to respect what he's done.
"When a quarterback runs a lot, the cornerback has to not only key his man, he has to key the quarterback as well because he's the primary force out there to force everything back in. It slows the cornerback down and Crabtree takes advantage of it."
Crabtree had his best ever season in the NFL in 2012, receiving the ball for 1,105 yards and catching nine touchdown passes.
The 49ers face the Falcons in the Georgia Dome on Sunday.