Of their battle for eighth place on lap seven of the race, di Grassi appeared to get caught throughout the nostril of the Nissan e.dams automotive of Buemi on the method to Flip 7.
Di Grassi, who retired from the race lead on Saturday with a mechanical failure, then careered into the wall and stopped down the escape street with damaged suspension.
A five-second penalty was added to Buemi’s race time, which dropped the 2015-16 title winner from seventh all the way down to an eventual tenth, and he was additionally handed two penalty factors on his license.
Di Grassi informed Motorsport.com: “There isn’t any my perspective or any perspective.
“There may be the angle of the principles and the stewards of the race. Buemi received a penalty. It was an extremely silly manoeuvre.”
The Brazilian took intention at a scarcity of tempo for the Nissan e.dams crew all weekend, with it unable to introduce its new automotive in Rome as initially deliberate. He added that with an eventual 16 laps remaining, Buemi ought to have bided his time.
Di Grassi stated: “He was simply gradual. He was gradual all weekend and he was gradual additionally in that particular race. I used to be doing my regular race. He had assault mode. He was attempting to overhaul me again.
“To be trustworthy, he may have overtaken. We had the entire race to go, there was no hurry to do that. He determined to alter, final minute, from inside to exterior.
“He ended up touching the rear of my automotive, after which ended my race and ended additionally his race. It is a disgrace.”
However Buemi fought again towards the stewards’ choice, including that di Grassi had lined up the overtake too late and left him with no time to react.
Buemi assessed the incident as “unlucky”.
He informed Motorsport.com: “Clearly, I received penalised for that. I do not actually comply with be trustworthy. That is the best way it’s.
“Arriving with assault mode, way more energy. In my view, he moved so late that I had no time to mainly react. I do not thoughts him closing the door. It is no downside, I am going on the opposite aspect. However he let me suppose that he was going to not shut the door.
“So as soon as I dedicated for the transfer, he got here to the left and on the identical level he did that, I touched him.”
Lucas Di Grassi, Audi Sport ABT Schaeffler, Audi e-tron FE07, climbs out of his automotive after crashing out
Picture by: Sam Bloxham / Motorsport Photographs