However Mark Bosomworth, general manager of George Weston's baking division, said all bread stock would be back to normal in store from today.
First Union organiser Anita Rosentreter said George Weston had come back with a slightly improved offer, which she would be presenting to workers today.
"My expectation would be that the members would say it's still not an adequate offer and that may be followed with further strike action, but at this point in time I can't confirm when that would be."
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George Weston warned there would be a resulting shortage on supermarket shelves in the upper North Island as production of baked goods was halved in its Auckland factories.
Signs were seen in supermarkets warning customers of a bread shortage.
"Due to Tip Top going on strike there is limited bread available. We hope to have a full range soon," the signs read.
Countdown spokeswoman Kate Porter said this morning that, like other retailers, the company's supermarkets were experiencing bread supply issues in the upper North Island.
"We're working with our bread suppliers and in-store bakeries to increase bread production where we can and ensure there is plenty of choice available today for our customers."
