Koo (groin) was a full participant in Wednesday's practice, Will McFadden of the Falcons' official site reports.
Koo wasn't able to suit up in Monday's loss to the Packers, but he now looks back to full health. The Falcons have already demoted Elliott Fry back to the practice squad, indicating Koo will be good to go for Atlanta's Week 5 matchup with the Panthers.