Disgraced former North Melbourne footballer Tarryn Thomas has reportedly found himself in hot water once again as police are investigating fresh allegations of harassment toward a former partner.

According to News Corp, Thomas, in recent weeks, has repeatedly attempted to make contact with his "estranged girlfriend" multiple times throughout the day and night.

On Channel 7's Sunrise, journalist Andrew McCormack said "a complaint has been made and that police are investigating after Tarryn Thomas allegedly made multiple phone calls to a former partner, both day and night.

"No charges have been laid but police are investigating.

"It is the same former estranged partner that Thomas is accused of sending threatening messages to in the past.

"In February, the AFL handed him an 18-match ban over those accused of threatening messages.

"North Melbourne then sacked him as a result."

NewsCorp reported that a Victoria Police spokesman said the latest allegations were reported last month.

“Police are investigating after reports of harassing phone contact,” he said.

“A report was made to police on April 11 and investigations into the incident remain ongoing.”

The new investigation comes shortly after Kangaroos boss Jennifer Watt warned rival clubs that Thomas has "not (been) able to meaningfully change", despite completing four programs to help modify his behaviour.

The email, attained by The Age, revealed the 24-year-old completed a quartet of programs before his sacking.

"Sonja (Hood, North Melbourne president) and I have been talking a lot about this, especially in light of the recent challenges we faced with Tarryn Thomas," the email read.

"We were struck by just how hard it was to find programs to support behaviour change. And this was for someone with considerable resources and support around them.

"We eventually found a combination of programs for Tarryn. Even though Tarryn ended up completing four different programs which included an extensive combination of education, therapy and participation style programs, we were not able to meaningfully change his behaviour.

"I make this point to demonstrate the depth of the problem and the need for broad reform. NMFC would support an industry initiative."