Honda has said that the door it not closed on the Japanese manufacturer supplying Red Bull with engines next season.
F1 supremo Bernie Ecclestone revealed in Austin that McLaren chairman Ron Dennis was blocking a Honda tie-up with Red Bull, because he believed it would not be in the team's best interests to expand its partner's supply deals.
But speaking in Mexico on Friday, Honda motorsport boss Yasuhisa Arai said that the matter was still not fully resolved, which suggested it could yet happen.
"We cannot discuss details at this moment, but we have been approached by a team and the discussions are ongoing," he explained.
"Nothing has been decided. I have always said this season, we are always open [to supplying more teams in the future], so we are in discussions that are ongoing."
Red Bull's options are believed to be either Honda or returning to Renault, despite having notified the French manufacturer that it wants to terminate the deal.