Like-for-like sales were down 2.1% (excluding fuel).
The retailer said consistently high levels of promotional activity in the market had also had a negative effect, with sales lower than anticipated.
However, Morrisons said it was making good progress delivering strategic initiatives, which would provide a solid foundation for future growth.
During the third quarter it introduced its Fresh Market format to a further 35 stores, and said it was on track to meet its target of extending the format to 100 stores by the end of this fiscal year.
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