On Friday afternoon, the NFL announced that three Denver Broncos players -- LB D.J. Williams, DL Ryan McBean and TE Virgil Green -- would serve suspensions for violating the league's substance abuse policy. Williams and McBean have been suspended for six games, while Green will have to sit out four games.

Related: D.J. Williams Drug Suspension: 'We Will Be Vigorously Pursuing My Rights In The Judicial System'

The league did not supply any specifics regarding the nature of the abuses in question, but later in the afternoon, Green took to Twitter to explain his particular situation.

I was suspended for taking ADHD medication prior to approval from NFL. I have now been approved to take the medication to treat my ADHD.

— Virgil Green (@VGreen85) March 10, 2012

I apologize to my teammates, the Bronco Organization and my family and friends. Thank you guys for all your support.

— Virgil Green (@VGreen85) March 10, 2012

Williams and McBean are expected to use legal action to fight their suspensions; no word yet whether or not Green plans to do the same.

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