John Singleton says he regrets having to bring rugby league personality Andrew Johns into the More Joyous racing inquiry.

The businessman said he had nothing negative to say about Johns, who gave evidence to the inquiry on Monday after initially declining.

"I love Andrew," Singleton said.

"I hated having to flush him out to be here.

"I hope we can continue to be friends."

Johns told the hearing he was certain bookmaker Tom Waterhouse did not tell him More Joyous was "off", but he couldn't remember exactly what he told punter Eddie Hayson at a football match the night before More Joyous finished second last in the All Aged Stakes.

The inquiry began on race day, April 27, immediately after Singleton claimed trainer Gai Waterhouse had revealed to her bookmaker son that the horse had problems and Tom had allegedly told Johns.

Johns said he had apologised to Singleton for possibly exaggerating when he spoke to Hayson after drinking four to six beers at the football.

After their conversation, Hayson had told Singleton he had heard More Joyous was not fit.

Johns told the inquiry, "I repeated the conversation which I had with Tom, but I cannot be certain of what I said ... I can swear on my life what Tom said to me, but I cannot be certain the way I worded it to Eddie Hayson," he said.

"That's where it's confusing to me ... I was having several conversations ... several friends with me ... I cannot be certain how I worded the conversation myself and Tom had.

"I'm not certain what I said to Mr Hayson at the rugby league on Friday night and then the Chinese whispers, as it's been reported, has gone from there," he said.

"I'm incredibly sorry ... I was devastated that somehow I've inadvertently caused the drama that went on, that is still going on 16 days after the event."

Referring to his use of the word "off" on the Nine network program The Footy Show the following day, Johns told the inquiry, "Tom never spoke about the health of the horse, he never mentioned the word 'off' ... I fumbled my words."

Speaking after the inquiry to Triple M radio, Johns said the pressure on his family had been enormous.

"Until you're in the headlights, until you're in the spotlight ... you have no idea the pressure it puts on you and your family," he told The Rush Hour.

"I may have exaggerated things, I've said that," he admitted.

"But to be chased around town with cameras outside my house for a week to spoil Mothers Day, my wife wouldn't stay at home because of the pressure; it's just not right."

He regretted not attending the inquiry last week, and said he had believed his statement given to the stewards would be enough.

"If I could rewind... I would have (gone) to the first inquiry - people saying I was hiding and running away and weak, what a bunch of malarky that was," Johns said.