Tesco has described itself as a "reluctant objector" to plans for an Ikea superstore in the Dublin suburbs.
It told a planning appeal the store would seriously disrupt its Irish business unless a solution were found to the traffic congestion it would create.
The development, a 320,000 sq ft retail and warehouse complex on a 100-acre site in Ballymun, would be Ikea's first development in the Irish Republic.
Tesco said it welcomed the development, and "strongly recommends that planning permission be granted". Its sole concern was the impact of congestion on a key distribution depot in Ballymun. In a submission to the hearing, Tesco said its depot, which cost €50m and opened four years ago, handled 25% of the Republic's fresh food. Delays in delivery schedules because of congestion "would have serious implications for our business", Tesco said.
It would also affect the business of 10,000 farmers and other suppliers, inconvenience consumers across the Republic and cause deterioration of the food being distributed.
If a solution could be found Tesco would withdraw its objection.
The Irish Planning Board, An Bord Pleanala, is expected to rule on the appeal in the next few months.