The Magpies boss accepts that the incident during their match against Hull City, which saw him handed a stadium and then touchline ban, affected his side negativelyNewcastle manager Alan Pardew accepts that headbutt on Hull City midfielder David Meyler became an unwanted "turning point" in his side's season.
After their resounding 4-1 win at the KC Stadium, the Magpies lost seven of their next eight games before beating Cardiff City 3-0 in their penultimate league clash to sew up a top-10 finish.
And the under-pressure Pardew, who was barred from the stadium for three games and the dugout for four more, feels that wore on his troops.
"It's a contrasting season," he told reporters. "The first half, I actually felt we played not far from our top level for most of that but, in the second half, we haven't been good enough, I haven't been good enough and the results have followed.
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"The Hull incident was obviously a turning point I definitely didn't want to have. I think that affected me and the team.
"I will make sure that never happens again. It stands out, if I'm honest, from anything else."
Reports have claimed that Newcastle have approached Saint-Etienne coach Christophe Galtier about potentially succeeding Pardew but the incumbent manager is adamant that he does not believe such speculation.
"I don't know who [Galtier] would have spoken to but there are only one or two people who really matter here and I don't think they have spoken to him," he remarked, "but that is part of business.
"Chairman, chief executives, managers, will all have a look at this season and draw breath a little bit, about how to go forward together and make sure that everyone is doing it with honesty and integrity.
"I think a couple of managers lost their jobs this year when, really and truly, were they treated with the right integrity and honesty?"