Peter Crouch put the Londoners in the driving seat of their last-16 tie with the Italian giants thanks to his 80th-minute winner, but the match was overshadowed by a horrific two-footed sliding tackle from the former Arsenal midfielder.
"The tackle from Flamini was a horrendous tackle. It was a sending off. He was two or three feet off the floor with two feet. It was a leg-breaking tackle," said Redknapp. "He will have an x-ray tomorrow but I don't think he has broken it but he could have done easily."
Redknapp now hopes UEFA decide to take retrospective action on Flamini, who could have been booked for a late tackle on Rafael van der Vaart in the first half.
He said: "I'd like them (UEFA) to have a look at that tackle. It was a leg-breaking tackle. How he doesn't give him a red card, I don't know."
Gennaro Gattuso is known for his combative displays but the fiery Italian lost his temper on several occasions on Tuesday night.
The 32-year-old responded to a second-half tackle by Steven Pienaar by squaring up to Spurs assistant Joe Jordan on the touchline after the Scot got to his feet to remonstrate with the referee for giving the foul.
Gattuso pushed Jordan and appeared to grab him by the throat before the two renewed their tussle after the final whistle, with the Milan skipper headbutting a man who used to play for the Rossoneri.
"I don't know why it all got so silly," Redknapp added. "Gattuso had a flair-up with Joe Jordan. I don't know why. He obviously hasn't done his homework. He could have picked a fight with someone other than Joe.
"He put his head into Joe's face for some reason. It was crazy. He lost his head during the game."
Source: PA
Source: PA