A decision on when to reopen McDonald's in Victoria Ave will be made today.
The city centre restaurant is closed after a fire in the kitchen on Wednesday night.
McDonald's spokesman Simon Kenny said the fire started in a vat unit just after 6pm.
"People might hear that it was a vat fire and assume the oil caught fire, but that wasn't how it happened," he said.
"It was an electrical fire in the vat unit itself, we believe."