According to the newspaper, the reports say that a massage therapist alleged last December that Spillman, then a member of the San Francisco 49ers, groped the woman, attempted to rip off her clothes and tried to force her to provide oral sex while he was receiving a massage.
Spillman reportedly denied the allegation, saying he engaged in voluntary fondling with the woman and that he did not attempt anything forceful.
Spillman was never charged or arrested in the wake of the woman's allegation. It isn't clear if the NFL is aware of the incident.
It was revealed last week that Spillman is being investigated for sexual assault in connection to an alleged incident that occurred at the Cowboys' team hotel in Grapevine, Texas, on Sept. 20.
In the wake of the recent controversy surrounding the NFL regarding domestic violence inflicted by players, head coach Jason Garrett had said before the news of the allegation against Spillman that any player involved in a domestic violence incident would not play until his situation was resolved.
Spillman has remained active since the allegation arose and Garrett has said that will remain the case. Owner Jerry Jones said Spillman's situation is different than the domestic violence cases involving former Baltimore Ravens running back Ray Rice, Carolina Panthers defensive end Greg Hardy and others because Spillman hasn't been arrested or charged.
A six-year veteran, Spillman was signed as an undrafted free agent in 2009 by the San Diego Chargers. He played for the 49ers for four seasons before signing with the Cowboys in August.
Spillman has played on special teams in all of Dallas's five games so far this season, recording two tackles.
- Ben Estes