McDonough joined Molson Coors, the beer company, in February this year.
Dee is currently marketing portfolio controller for Muller Dairy's family range of brands, which includes its flagship brand Muller Corner and its Little Stars children's brand.
Dee has previously been marketing portfolio controller at the yoghurt maker with responsibility for Mullerlight and its Vitality brands.
He joined the company in 2002 from WH Smith.
Muller did not disclose whether the interim appointment would lead to a permanent role, saying Dee would "remain in place until Muller Dairy completes the recruitment programme for the marketing role".
to front a new £2m campaign for its Vitality range.
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