Dale Zanine-USA TODAY Sports

The Atlanta Falcons have just three regular season games remaining - and fullback Keith Smith won't be able to play in any of them.

Atlanta announced Saturday that Smith has been sent to injured reserve with an ankle injury. The four-game mandate for injured reserve placements effectively ends Smith's year.

Smith was a full participant in practice Wednesday and Thursday but wasn't seen Friday. On Atlanta's injury report issued Friday, Smith was officially declared doubtful to play this Sunday against the Indianapolis Colts.

The 31-year-old Smith played in 13 games this season, catching all three of his targets for 33 yards. He's recovered a fumble in each of Atlanta's past two games.

Smith saw time on 21 percent of the Falcons' offensive snaps and 65 percent of their special teams snaps.

In the wake of Smith's absence, Atlanta signed tight end Tucker Fisk to the active roster.

The 24-year-old Fisk has played in three games this year and caught his first career pass in last Sunday's 9-7 loss to the Carolina Panthers.

Additionally, the Falcons elevated punter Pat O'Donnell and offensive lineman John Leglue from the practice squad to the active roster.

O'Donnell is in line to replace incumbent punter Bradley Pinion, who missed practice Friday as his wife went into labor.

The Falcons (6-8) and Colts (8-6) are set to kick off at 1 p.m. EST Sunday inside Mercedes-Benz Stadium.

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