Jesse Marsch and his Canada side recorded a 6-0 win over Qatar in their second Group B match at this summer's World Cup - the country's first-ever victory at the Finals.
However, the feat was marred by a horrific injury to Canada's Ismael Kone during the second half of the match.
Sassuolo midfielder Kone was tackled unlawfully by Qatar player Assim Madibo, resulting in a serious leg injury for the Canada man.
Jesse Marsch accuses Qatar staff of 'strange behaviour'
Players formed a protective huddle around Kone whilst he underwent treatment for his injury, which is a suspected leg break.
Madibo was initially shown a yellow card which after VAR review was upgraded to a red and ordered from the field.
It left Qatar with nine men after an earlier sending off had cost Homam Elamin his place in the game.
Following Madibo's tackle and ensuing medical intervention on the field, members of Canada and Qatar backroom staff had to be separated as tempers flared.
Then, at full-time, Marsch and Lopetegui became involved in an altercation that saw Lopetegui deep in conversation with the former Leeds manager.
Marsch, evidently unhappy with what the Qatar boss had to say, thrust his arms into the air and walked away from Lopetegui, before refusing to discuss his opposite number in the post-match press conference.
"I'm not wasting a single second talking about that," Marsch told reporters, adding it was 'strange behaviour' from the Qatar bench to argue Madibo should not have been expelled from the field.
“The player apologised to Ismael," Marsch added. "He came into the dressing room. The team let him know that happened.”
The Canada boss and Kone's teammates have since paid a visit to the 24-year-old in a nearby Vancouver hospital before he undergoes surgery.
Canada are expected to qualify for the Round of 32 courtesy of the four points gained from their opening two Group B matches. Their final group stage match is versus Switzerland next Wednesday, June 24.
