GM's boss has reiterated that the company is open to offers for Vauxhall/Opel, even though it is hoping to conclude a deal with Magna International.
Speaking to Congress, GM CEO Fritz Henderson said: "We're just negotiating, we don't have an exclusivity agreement (with Magna), so we are open to discussion with others.
"We are spending a lot of time with Magna trying to negotiate a more definitive agreement."
However, despite reports that BAIC and Fiat may be considering improving their bids, Magna is still favourite to takeover Vauxhall/Opel.
Commenting on the Magna talks, the premier of the eastern German state of Thuringia, Dieter Althaus, said "I'm very optimistic that the negotiations will come to a good conclusion. I don't see any real risks at the moment either."
Last week, Fiat CEO Sergio Marchionne reiterated the carmaker's interest in taking over Opel.