A Marmion Academy assistant football coach has accused state Sen. Chris Lauzen of committing battery during an altercation after the football team’s final game last weekend.

Authorities have not filed charges against Lauzen, who called the allegation “a lie.” But police are investigating the claims of the 26-year-old McHenry man who said the Aurora Republican grabbed him by the arm, poked him in the chest and swore at him.

Lauzen said he touched the coach with two fingers to hold him at arm’s length after the coach approached him aggressively.

“I had two extended fingers, (as if to say) ‘Just get away from me,’ ” said Lauzen, a state senator since 1993. “He came to me. He was the guy being restrained. He was the guy told by the head coach, ‘Back off, back off. You’re out of line.’ “

Matthew K. Welch, a Marmion graduate who is the team’s offensive coordinator, filed a complaint with Aurora police Thursday, claiming Lauzen confronted him after the team’s season-ending victory against Aurora Central Catholic High School. [Snip]

The school’s headmaster, who did not see the incident, called the complaint “much ado about nothing.”

Head coach Tony Tinerella, a dean at the school, said he saw the argument from across the field and told Welch to stop yelling. Tinerella said he did not know who started the altercation.

Headmaster John Milroy said his understanding of the incident suggests the allegations are unwarranted. [Snip]

“I’m just trying to stand up and do what I think is right,” Welch said.