It is believed that the two companies will move into Churchtown service station, located west of the A6, near Garstang.
The change is part of major revamp of the service station.
It is set to be completely modernised to include five double-sided pumps, 17 customer parking spaces, four staff parking places, three HGV fuelling stations, one roller car wash, two jets for car washing and one water and air station.
Work on the project is due to start in August and could be finished by November, according to the planning agent for the project, Paul Walton Associates.
A statement submitted to Wyre Council by Paul Walton associates as part of a planning application, says: “The applicant is looking to redevelop the site in order to improve the quality of service available.
“This will include replacing the existing dated petrol pumps, increasing the number from three twin-sided pumps- six fuelling pumps - to five twin sided pumps - 10 fuelling pumps - along with increasing the ancillary retail unit to 372m squared.”
It is believed that this retail unit will contain the concessions for Marks and Spencer and Costa Coffee.
The statement contined: “Through careful material selection and a suitable layout it is considered that redevelopment would represent a high quality improvement to the current operations in respect of visual appearance.
“The finalised development will be finished utilising timber, but also incorporating a high level of glazing”
A new “elegant” design will see timber and steel combined to create a forecourt canopy, giving the garage a new modern look.
The two retailers today said they could not confirm that they would be moving into the site.
However, both have recently been expanding their concessions, particularly into service stations on motorways and in other locations.
Wyre Council will decide on the application by the service station in due course.