Production of the MGTF sports car restarted at the factory in 2008
MG sports car production in Longbridge has stopped and will not resume until the spring, the company has confirmed.
However, the Chinese-owned firm MG Motor said it could not comment on reports that 20 jobs would be lost at the plant in south Birmingham.
In a statement, MG Motor said it had notified staff of the highest possible number of redundancies and said it was working to minimise that number.
Production of the MGTF sports car restarted at the factory last year.
The company's statement said: "Clearly this is a difficult time for employees and it would be irresponsible to make this a bigger issue than it is and to worry more people than absolutely necessary."
It added that speculation was "not helpful at the moment".