Denver Broncos linebacker Dre Greenlaw was suspended one game by the NFL for unsportsmanlike conduct toward a referee following Sunday's win against the New York Giants , the league announced Monday.

According to the NFL's statement, Greenlaw "chased after referee Brad Allen and verbally threatened him as he tried to leave the field."

Video posted by a CBS Colorado reporter shows Greenlaw's encounter with Allen.

The NFL said Greenlaw violated Rule 12, Section 3, Article 1(b), which prohibits "the use of abusive, threatening or insulting language or gestures to opponents, teammates, officials, or representatives of the League."

Greenlaw has three days to appeal his suspension under the collective bargaining agreement.

If he does not appeal or the suspension is upheld, he would sit

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