Dec.13 (GMM) Sauber is the first team to announce publicly that its 2013 car is "ready" to test.
The Ferrari-powered car is therefore "fully homologated and ready for winter testing", which will kick off at Jerez in early February.
The German-language Speed Week reports that almost every other team should also be ready for the first four-day session in southern Spain, even though Red Bull's Christian Horner is quoted as saying: "It will be pretty darn close.
"You know Adrian Newey," he joked.
Speed Week also said a slight question mark hangs above Caterham's plans, who are aiming for a Jerez debut but actually might only begin running with the 2013 car in Barcelona two weeks later.
"The same goes for Williams," the report claimed.