Andretti had a pre-contract agreement with Renault, but it lapsed in the summer as the process of gaining an entry dragged on for longer than either party had anticipated.
The FIA gave the new project the official go-ahead in October, with a final decision then passed to the F1 organisation and its CEO Stefano Domenicali.
Since then the situation has changed with General Motors confirming that it is stepping up from a simple partnership role and intends to develop its own power unit for 2027 or 2028.
Despite Andretti strengthening its ties with a rival manufacturer Famin says that Renault is still willing to supply the new team in the interim seasons before the Cadillac power unit is ready.
If the team meets its stated target of starting in 2025 it would contest one season with the current specification power unit before the new regulations come into force in 2026.
While Andretti clearly has a cut-off point for an entry decision from F1 in order to be ready to race in 2025, Renault also needs sufficient notice in order to ramp up production and be in a position to supply a second team.
"We are talking to Andretti and to General Motors and we are happy to talk to them,” said Famin when asked about the situation by Autosport.
Source: Autosport