(AP Photo)

FRISCO, Texas (AP) Dallas defensive end David Irving has been suspended the first four games of the season for violating the NFL's policy against performance-enhancing drugs.

The ban announced Wednesday leaves the Cowboys without two potential starting pass rushers because of suspensions. Randy Gregory, a second-round pick who slid in the 2015 draft because of concerns over marijuana use, is likely to miss the entire season for multiple violations of the substance-abuse policy.

Irving, one of the team's best pass rushers at the end of last season, can return Oct. 8 against Green Bay at home. The third-year player is eligible for training camp and preseason practices and games.

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