Ferrari and Red Bull continue engine supply talks at Suzuka

Red Bull chiefs were having more meetings with their Ferrari counterparts on Saturday in an attempt to reach an agreement regarding an Formula 1 engine supply.

The talks at Suzuka are amid the very real threat that the energy drink company could pull both of its teams - Red Bull and Toro Rosso - out of the sport after November's Abu Dhabi grand prix.

With Mercedes now out of the question, Red Bull is demanding that it must now conclude a deal with the other competitive engine supplier for a full 'A' spec of Ferrari's power unit.

One of those in Saturday's Ferrari meetings was the Red Bull official Helmut Marko, who told Sport Bild: "We are waiting for a proper piece of paper on which we are offered a competitive engine for 2016. Otherwise, formula one loses four cars."

Perhaps to sweeten the deal, Red Bull has hinted that as the Ferrari works team tries to chase down Mercedes for the title, it may be able to help in Japan.

"If Vettel is on top again and Mercedes is again weaker, we could get between the Ferrari and the Mercedes and save Sebastian [Vettel] a few points in his fightback," said Marko.