Nottingham Forest owner Evangelos Marinakis reportedly erupted in a furious tunnel outburst following his club's 2-2 draw with relegated Leicester City on Sunday.
A win would have moved Forest into the Champions League places once again.
Marinakis was furious with the handling of Taiwo Awoniyi's injury during the match.
The striker had collided with the post and was cleared to continue playing by medical staff.
Evangelos Marinakis was not happy during his side's match with Leicester
Reuters
However, it was apparent that Awoniyi was not fit to carry on, which sparked the owner's rage.
The incident led to a heated confrontation that began on the pitch and continued in the tunnel area at the City Ground, reports The Sun.
Eyewitnesses saw Marinakis lose his temper once more with Nuno Espirito Santo in the tunnel, before also venting his frustration at Awoniyi himself and the medical staff.
Those present felt the tunnel confrontation was significantly more intense than what had been witnessed publicly.
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The owner is typically seen in the tunnel after victories to celebrate with his players.
This time, however, his appearance was marked by anger rather than celebration.
Following the incident, Marinakis issued a statement acknowledging the frustration over Awoniyi's injury situation.
The owner and manager got into a heated conversation after the final whistle
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"Everybody coaching staff, players, supporters and including myself we were frustrated around the injury of Taiwo and the medical staff's misjudgement on Taiwo's ability to continue the game," he said.
"This is natural, this is a demonstration of the passion we feel for our club. Let's all be grateful, passionate and keep on dreaming!"
Nuno responded to the outburst by describing it as "disappointing for everyone".
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"It was too painful for Taiwo to push and help the team and it was a misunderstanding between the coaching staff and the medical department," the Forest manager explained.
Despite the confrontation, Nuno praised Marinakis' involvement with the club.
"It's because of the owner and his passion that we are growing as a club," he said. "He pushes us and wants us to be better."
This is not the first time Marinakis has courted controversy at Forest.
Many fans and pundits are calling his behaviour 'unacceptable'
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Last year he received a five-match stadium ban after spitting towards match officials following a 1-0 defeat to Fulham.
More recently, Marinakis officially relinquished day-to-day control of Forest by placing his shares in a blind trust.
This move was reportedly pre-emptive to avoid potential issues should Forest and Olympiakos, which he also owns alongside Portuguese side Rio Ave, both qualify for the Champions League.
