Pittsburgh Steelers LB Anthony Chickillo spent part of his bye week behind bars ... TMZ Sports has confirmed the 26-year-old was arrested after cops say he admitted to getting violent with his track star GF.
Cops say Chickillo was out at the exclusive Nemacolin Woodlands Resort in Farmington, Penn. when he got into an argument with his girlfriend, Canadian track athlete Alysha Newman at the place's casino.
FYI, 25-year-old Newman is a star pole vaulter in Canada. She made the Olympic team in 2016 and won gold at the 2018 Commonwealth Games.