The NFL says 49ers coach Jim Harbaugh and Lions coach Jim Schwartz will not face any further action after what is fondly being called "Handshake-gate".
"Fortunately, there was no fighting and thus no basis for a fine," the NFL spokesman told the NFL network in a statement.
"However, both coaches told (NFL vice president of football operations) Ray Anderson today that their postgame conduct was wrong and will not happen again. We believe their response is the correct one and that their postgame conduct going forward will be more appropriate."
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Harbaugh stopped short of apologizing.
"Personally I can get better at the postgame handshake and we'll attempt to do that," he said during his weekly news conference on Monday. "I don't think that there's any reason for an apology. We spoke about it after the game, and at some point we will talk in private. Apologies always seem to me like excuses."
Schwartz didn't apologize either.