Thomas Tuchel and Antonio Conte were the only two managers to miss the Premier League's pre-season briefing regarding referees.
The Telegraph reports that the Chelsea and Tottenham bosses were not in attendance at either meeting arranged by the Premier League.
The Premier League encourages all managers to attend one of the two meetings that are overseen by the referees' group Professional Game Match Officials Limited.
Tuchel and Conte clashed with each other during the 2-2 draw between Chelsea and Tottenham at Stamford Bridge on Sunday.