The lawyer for Minnesota Vikings star running back Adrian Peterson has issued a denial of allegations that there was a second child abuse complaint against him.

"The allegation of another investigation into Adrian Peterson is simply not true," Peterson's lawyer, Rusty Hardin, said in a statement. "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 boy's mother filed a report with Child Protective Services, but no charges were filed.

Peterson was arrested for causing injuries to his four-year-old son, including damage to his scrotum, buttocks, back and hands.

In the other case, Peterson allegedly caused left a scar over the boy's right eye.

The Vikings were aware of the previous allegation against Peterson.

“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 Vikings said in a statement. "We will defer any further questions to Adrian’s attorney Rusty Hardin."

The Vikings are letting Peterson play because of due process after deactivating him for their game Sunday, but are now letting him play for the remainder of the season.

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Aaron Wilson covers the Ravens for The Baltimore Sun