Leicester director of rugby Richard Cockerill said Sale came to "cheat and cheat and cheat" after they edged out the Sharks 30-23 at Welford Road.
A sold-out crowd watched the Tigers win thanks to scores from Ed Slater, Adam Thompstone and a penalty try but Sale almost cause a big upset.
Cockerill though blamed Sale director of rugby Steve Diamond for his own side's inability to kill off the visitors, saying their scrum was illegal.
"Sale were competitive but when sides come to cheat and cheat and cheat .... They were not engaging properly," said the former hooker.
"In the first half we had a scrum and we engaged and they just backed out and we got a free kick.
"I wrote that on the half-time card and the referee then warned them in the second half that they were not taking the engage.
"They just walked backwards, so we got a free kick. If that is how we are going to coach scrummaging, it's no wonder scrums are a disgrace.
"If Steve Diamond is coaching scrums like that we might as well go home because it's a waste of time.
"You watch Montpellier v Leicester where we had two scrums who wanted to push. It was a great contest. That today was an absolute debacle and hard for the referee."
Diamond gave a response: "That's fine coming from an individual like Richard Cockerill. His controversies with referees go before him. It's for the referee to decide not Richard.
"I thought his side deserved the win. But if we want to go down the fine art decisions route there were four penalties in the last minute on their five-metre line where no yellow card was given.
"We have got equal things to discuss. He can bleat as much as he wants. Leicester should shut up, take the points and move on."