Ange Postecoglou is reportedly facing an FA probe over his comments following Tottenham's 2-1 home defeat by Newcastle.
Spurs continued their poor form as they suffered a 10th league defeat of the season and Postecoglou was left aggrieved by some of referee Andrew Madley's decisions.
His sense of injustice revolved around Newcastle's first goal, an equaliser scored by Anthony Gordon after the ball clearly struck Joelinton on the hand as he blocked a pass.
Referee Madley did not see an offence and it was not overruled by the VAR Chris Kavanagh because Joelinton's hand was in a natural position and the contact was ruled to be accidental.
Postecoglou said after the game: 'On the balance of play, any balance you want with all things being equal, we would have won today. Things weren't equal and balanced.'
When pushed by the reporter on what decisions he particularly disagreed with, the 59-year-old lashed out.
'You can talk about whatever you want,' he said. 'You want my opinion - if all things were equal and balanced we would have won.'
As reported by the Mirror, Postecoglou could be in trouble, though managers are allowed to express opinions on referees and decisions if they don't hint at bias or question an official's integrity.
The FA have not launched a full investigation yet but want to know what Postecoglou meant with his comments.
If the Australian admits his comments were directed at the referee, he could face a touchline ban or a fined.
Tottenham were incensed when a foul was awarded against Dan Burn for a similar handball offence as the game escaped them. Alexander Isak scored Newcastle's winner.
Spurs, with 10 first-teamers missing at kick-off and others suffering from illness, led through Dominic Solanke and produced a spirited fight back but could not find a second.
'We were outstanding,' said Postecoglou. 'Our football was outstanding against a very good opponent in good form. It was brilliant, outstanding, a game we deserved to win and on any other day we would have won.
'Radu Dragusin and Archie Gray literally got off sickbeds to play, and Radu was shattered at half-time. He didn't have any more to give.
'On Thursday, we literally had 11 fit players for training. But I don't care about that, what I care about is the players put in an unbelievable performance, fantastic football, created chances, denied them and having to defend strongly which we did.
'And it's unfair on them more than anything else that they didn't get the rewards today.'