Now, the parties are targeting Singapore in two weeks.
"There's not much left to agree with Checo (continuing)," sporting boss Otmar Szafnauer said.
As for the long delay in announcing the deal, however, he explained: "I don't think it's a secret that since he (Perez) started racing, he has had Mexican sponsors.
"So the difficult thing is that with Checo you almost have to do two contracts," Szafnauer added.
"We agree completely with Checo, but we must also look to the side with his supporters."
"So for the moment, everything is still open," Lauda added.
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