The Falcons will be down a wide receiver at the start of training camp.
Coach Mike Smith said Davis is anticipated to miss “around six weeks,” according to a team-issued statement.
A third-year pro from Oregon, the 25-year-old Davis appeared in all 16 games for Atlanta in 2013, catching 12 passes for 216 yards and two touchdowns. He also notched seven special teams tackles.
Davis’ injury was discovered at the conclusion of minicamp, Smith said.
Including Davis, the Falcons have 12 receivers, including special teams ace Courtney Roby, whom the club signed last week.