Detroit Lions Coach Jim Schwartz said he spoke today with NFL officials and San Francisco 49ers Coach Jim Harbaugh, the man whose enthusiasm nearly slopped over into a postgame fight with Schwartz on Sunday.

“It's unfortunate,” Schwartz told reporters (via ESPN). “The game is played by the players on the field. We certainly don’t want things like that to occur. There are competitive people in the league, and I think we need to do a better job of just leaving it to the players on the field.”

Related: Jim Harbaugh’s brother is kind of amused.

NFL spokesman Greg Aiello confirmed Monday that the league is looking into the incident and Schwartz, whose donnybrook most likely will draw disciplinary action, was asked if he planned to apologize to Harbaugh. “It was a regrettable situation. Particularly that it detracted from what happened in the game,” he said. “I think I'll just leave it right there.”

After Harbaugh, in the excitement of his team’s 25-19 victory, vigorously shook Schwartz’s hand and slapped him on the back, Schwartz — who isn’t exactly Tom Landry-like in his sideline restraint — bumped Harbaugh and was restrained by security from pursuing Harbaugh.

Schwartz did not indicate what he and Harbaugh discussed and said the two, who were with the Baltimore Ravens at the same time in 1998, are likely to speak again. “It is what it is. It happened. It was very regrettable. It's something where there is nothing going forward between us personally or the two teams.”