Attorney Rusty Hardin said these latest allegations are more than a year old and that authorities took no action.
Peterson is charged with reckless or negligent injury to a child after authorities said that he hit his four-year-old son with a switch. Peterson did not play in Sunday's game but is expected to be in the lineup for Sunday's game against the New Orleans Saints.
Houston television station KHOU reported Monday that Peterson was accused in a separate incident in which a woman said that her child, which she had with Peterson, was being abused.
"The allegation of another investigation into Adrian Peterson is simply not true," Hardin said. "This is not a new allegation, it's one that is unsubstantiated and was shopped around to authorities in two states over a year ago and nothing came of it. An adult witness adamantly insists Adrian did nothing inappropriate with his son. There is no ongoing or new investigation."
The Vikings said they were aware of the 2013 allegations, but would defer any further questions to Hardin.
"As part of the information we have gathered throughout this process, we were made aware of an allegation from 2013 in which authorities took no action against Adrian," the team said.
- Scooby Axson