The developing claims have been brought forward to the league, who has requested that Thomas meet at AFL House on Thursday, according to 9News Melbourne.
Thomas spent much of the 2023 season bouncing from controversy to controversy, facing allegations including threatening behaviour towards women.
He was stood down in February of last year when allegations first emerged, and then again at the end of March.
The 23-year-old returned to training with the VFL program in mid-April under directive from club specialists.
North Melbourne senior officials told 9News Melbourne that they are also investigating the allegations, with the club releasing a short statement on Wednesday night.
“North Melbourne received notification from the AFL Integrity Unit on Wednesday that Tarryn Thomas is under investigation following a new allegation of inappropriate behaviour,” the statement read.
“The club is working through this information and is not in a position to make any further comment.”
Thomas played 12 games last season.