Cornish, who is the Stamps' starting running back, says the move was a big mistake on his part.
"I definitely just took it one step too far, or maybe a few steps too far," Cornish said on Monday.
"You know, it reflects poorly on the organization, so first of all I want apologize to coach Huf, all the coaches, my teammates, all the Stampeder fans, the Stampeder organization and the Rider fans — 'cause they don't deserve that, I mean no fans deserve that."
Cornish also tweeted on Monday that his "conduct last night was unbecoming of a professional athlete."
Stamps general manager John Hufnagel says he is very disappointed in Cornish, who will be fined.Suggest a correction