Countdown is assuring customers its Christchurch stores are open and safe, after earlier reports of damage and injury turned out to be false.

A Christchurch man claimed on Sunday that a woman had a heart attack and the roof collapsed at Countdown Eastgate during Sunday's magnitude 5.7 quake.

However, he has since retracted the claims, saying they were not true.

Countdown today reiterated there was no damage or injury, and its stores all remain open.

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"Thankfully, during the earthquake no Countdown customers or team members were injured," spokesman James Walker said.

"Countdown Eastgate suffered no structural damage during the earthquake; which was confirmed by an engineer's inspection. Previous reports of damage and injury were incorrect.

"All Countdown stores are open and operational in Christchurch."