Trailing 3-0 from the first leg, Juventus managed to lead 3-0 in the second leg, and with minutes remaining at the Bernabau the tie seemed destined to head to extra time.
While the decision divided many in the footballing world, the Italian goalkeeper went on a scathing attack, calling Oliver "an animal" and claiming he has "a trash can in place of a heart", which Del Piero believes was out of order.
He said, "The content remains and I stand by all of it", the keeper told Italian TV.
"If you do not have personality and courage, you should go to the stands to watch the match with your wife and with a Sprite".
The 2006 World Cup victor called time on his decorated career in November following a stint with Major League Soccer side New York City.
The Champions League knockout stages continued to enthral as Gianluigi Buffon was sent off at the Bernabeu. "I know the referee saw, it was certainly a dubious incident".
"It disappointed me to leave the boys with 10 men, but I said objectively Real Madrid deserved the victory, we shake their hands and move on".
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It was the fourth time he had been sent off but the first in his distinguished Champions League career.
"The referee did not understand anything, and tonight the least happy person of all should be him", said Agnelli.
If an outing against Real is to be Buffon's last in Europe, and the end nigh on a domestic front, then he will bow out having made over 850 club appearances and earned 176 caps for his country.
"It hurts badly, very badly", agreed Italian daily Corriere della Sera.
Newspaper Gazzetta dello Sport branded Oliver "not up to standard". Buffon was red-carded for his reaction and Cristiano Ronaldo slotted home from the spot.
'I don't have to make up for anything, because I am a human being who puts passion, sentiment and anger into what I do, ' Buffon told television programme Le Iene, via Football Italia.
Buffon has played 635 times in Italy's top flight, but with seven games remaining this season he would fall short of former AC Milan defender Maldini's record of 647.