The firm's 6,000 workers are waiting for news from negotiations in China between MG Rover, SAIC and the Government.
Meanwhile, workers are still waiting to learn whether the Government will make a £100m bridging loan to Rover.
MG Rover has suffered another poor month of sales. According to the Society for Motor Manufacturers and Traders (SMMT) 6,608 Rover cars were registered in March, down from the 9,247 sold in the same month of 2004 - a drop of 28.5%.
MG sales rose to 5,937 last month from 5,810 in March 2004.
Despite the fall, Rover said it had not fared too badly as UK car sales industry-wide were down 5.1%.