Manchester City players Kyle Walker (centre) and Erling Haaland (right) were among those involved in the post-match exchange
After the final whistle at Emirates Stadium, Walker and Haaland confronted Arsenal set-piece coach Nicolas Jover, who previously worked at City.
"I know what happened but I won't say anything," Guardiola said with a smile.
"They [Arsenal] know it," he added.
Gabriel Martinelli scored a dramatic late winner as Arsenal earned a statement victory over defending Premier League champions Manchester City on Sunday.
As the players headed towards the tunnel at full-time, Walker turned back to confront Jover, with Haaland joining him, before several players and members of staff from both clubs acted to separate them.
The disagreements continued as the Manchester City players left the field, with Arsenal's Bukayo Saka taking Jover away from the situation.
Jover was at City from 2019 until 2021, when he joined the club's former assistant manager Arteta at the Gunners.
-- Courtesy of BBC Sport