Head slates Williams drivers

The incident took place on lap two of the race as the pair disputed fourth position. Montoya tried to pass Schumacher around the outside, but the German lost control of his car on the kerbs and spun into his team-mate.

Ralf's car lost its rear wing, while Montoya dropped to seventh.

Head was furious: "For the amount of effort that goes into this, to have that happen is completely unacceptable. We'll talk about it afterwards and try to sort out how it doesn't happen again.

"I'm not into apportioning blame between the two of them. We've had some fantastic drivers in the past but they just haven't driven into each other. It's absolutely ridiculous."

Montoya recovered to take fourth place, but Head believed he could have been third had he followed team orders on pit strategy.

"We did everything to try and not get a podium," Head added. "He came into the pits for his pit stop when he had lots of fuel on board for many more laps, so why he came in we don't know. We'll have to look at it afterwards.

"Altogether we found the ways of doing it wrong. We should have had a good solid third and fourth here."

Indianapolis was not the first time the Williams drivers have compromised each other this year. The pair almost clashed at the start of the last GP at Monza.