North Lanarkshire Council has admitted it is considering imposing parking charges at the site, which is currently free to use.
Croy Station is one of several such locations where charges may soon be introduced by the local authority, which needs to find ways to save 55million in the next two years.
Graham MacKay, Head of Roads and Transportation, said: "The council agreed last year to carry out a consultation on the possibility of introducing parking charges as part of a parking management strategy.
"This consultation is currently considering if charges should be introduced in town centre car parks and in some 'park and ride' facilities, including Croy.
"The consultation is continuing and residents will have an opportunity to give their views. They can also give comments via our Hard Choices, Big Decisions consultation on a range of savings options."
Jamie Hepburn MSP has written to Mr MacKay to express his opposition to such charges.
He said: "The council must come clean about its plans, and it must not see Croy and other park-and-ride facilities as cash cows. In times of economic difficulty it must be as easy as possible for people to switch from cars to public transport."