The Falcons have a little bit of flexibility to sign players, should injury or need arise.
Right now, per the best estimates available, the Atlanta Falcons have between $14 and $16 million in cap space. That's a decent chunk of change, most of which is likely ticketed to contingencies and a Julio Jones extension. It's a boring thing to say, but I doubt we'll see any other major signings between now and the season.
The calculus changes if you think there are worthy free agents available to patch needs, and depending on the stringency of your definition, there may well be.