Kirk Cousins and the Atlanta Falcons made a disappointing start to the NFL season with a defeat, but coach Raheem Morris says he was not hindered by injury.

The quarterback struggled in an 18-10 loss to the Pittsburgh Steelers on Sunday, playing his first game since suffering a torn Achilles in week 8 last season.

Against the Steelers, he was 16-of-26 for 155 yards, with one touchdown and two interceptions overall. In the second half, Cousins had just 19 passing yards, the lowest total of his career.

The 36-year-old did not play in pre-season, but Morris believes his performance likely came from "some rust from not playing for so long".

"I feel like Kirk is healthy," Morris said on Monday. "He's been healthy since he's been here.

"With Kirk being here, we've been doing the same thing since he's been here, and that's how we've planned on playing and we've played that way throughout."

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Many thought new offensive coordinator Zac Robinson's play-calling was designed to protect Cousins after his lengthy lay-off, though it did not pay off as the Steelers' defense dominated much of the game.

"We played, I thought, winning football in two phases of the game, and we didn't play winning football in our offensive phase of the game," Morris added.

"The plan was to go out there and win the football game, but it exposed some things inside for us.

"We want to get better. But we got to play better at the [quarterback] position, we got to play better around him."

The Falcons’ next game is against the Philadelphia Eagles.