FLOWERY BRANCH — Rookie safety William Moore, the Atlanta Falcons' second-round pick from Missouri, is expected to miss two to four weeks following arthroscopic surgery on his left knee.

Moore was playing behind Erik Coleman at free safety before hurting his left knee on Tuesday. Moore also had a chance to compete with Thomas DeCoud at strong safety.

Falcons coach Mike Smith called Thursday's procedure "nothing major". The team did not release details on the surgery.