Red Bull motorsport consultant Helmut Marko has admitted that Toro Rosso could turn yellow in order to help the marketing strategy of engine suppliers Renault.

Both Red Bull and their junior team are powered by Renault engines, although both companies have threatened to pull out of the sport due to a poor start to the season.

Red Bull appear to be down on power in comparison to Mercedes and Ferrari, and both they and Renault have blamed each other.

Marko told F1.com: "Renault are spending a lot of money on this power unit - not as much as Mercedes but a significant amount - and are confronted with the same issues that we have: their F1 involvement has to pay off.

"Add to that that Renault feels under-represented on the marketing side so there are considerations to either buy Toro Rosso or more likely give them a yellow livery to have a better marketing platform. But of course the figures have to correspond."

Red Bull and Renault won four consecutive championships together between 2010 and 2013.