Popular fast food chain Oporto has been forced to close the doors of one of its Sydney outlets after it was revealed the store had a horrendous rat infestation.

Footage posted to Facebook by Vijay Kumar shows large rats running around the store, leaping on counters and scurrying into the kitchen of the Broadway fast food outlet.

“This one goes out to all the Oporto lovers out there! Think zillion times before you walk again into this place,” Mr Kumar wrote along with the video.

“Todays Special — Spicy Gluten free Rat burgers!”

Craveable Brands, which owns Oporto, Red Rooster and Chicken Treat, told news.com.au that it shut the store down as soon as the company became aware of the video on January 17.

“Oporto stores across Australia maintain rigorously high sanitation standards. This is a one-off situation related to a single store in Broadway, Sydney,” the organisation said in a statement.

“Vermin appear to have been dislocated by external construction activity in the Broadway area, which can lead to increased activity for surrounding businesses. Vermin appear to have accessed the Broadway restaurant via a ventilation hole, or other access point from outside.”