Redskins cornerback Phillip Buchanon faces a four-game unpaid suspension because he violated the league’s performance enhancing drug policy, according to the NFL.

Coach Mike Shanahan said shortly after the Redskins signed the 10-year veteran that he expected Buchanon to face a suspension but declined to specify the alleged infraction. Buchanon has declined all interview requests during the preseason and his agent didn’t immediately return a message seeking comment Friday.

The Redskins must cut their roster from 80 to 53 players Saturday, and if they choose to keep Buchanon, he will not count against their number. Instead, he’ll be on the team’s suspended list and won’t be eligible to join the active roster until after the team’s Week 4 game at St. Louis. The Redskins are off Week 5 and play host to Philadelphia on Oct. 16, the first game in which Buchanon can play.

Buchanon’s suspension formally begins Saturday.