Dallas Cowboys middle linebacker Rolando McClain has been suspended without pay for the first four games for violating the NFL substance-abuse policy. "I apologize to my family, the Cowboys organization, my teammates and Cowboys fans for my mistake," McClain said in a statement. "I will not break the rules of my profession in the future, and I regret my error. I look forward to returning to the field on week 5, when I hope to help my team beat the Patriots." McClain had 108 tackles last season despite missing four games with injuries. He was re-signed to a one-year deal that included a $500,000 signing bonus and a $750,000 base salary. McClain unretired last year and revived his career with the Cowboys. He was traded from the Baltimore Ravens. Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun