49ers linebacker Clark Haggans was suspended for three games for violating the league’s substance abuse policy. (Christian Petersen/Getty Images)

The NFL suspended San Francisco 49ers linebacker Clark Haggans for three games for violating the NFL’s substance abuse policy, the team announced in a statement.

Haggans was suspended as a result of his guilty plea on a charge of extreme DUI. Extreme DUI is for driving with a blood alcohol level of higher than .15.

“We were certainly aware that this decision was a possibility as we evaluated Clark prior to adding him to our roster. Therefore, we are prepared to move forward accordingly,” 49ers general manager Trent Baalke said.

This is Haggans second time being convicted of DUI and he is eligible to return to the active roster on Oct. 8.

Haggans, 35, has dressed for the 49ers first two games but did not see the field.

Haggans, who played with Arizona Cardinals the past four seasons, served jail time for the DUI charge in June.

Clark Haggans will return for another NFL season after re-signing with the Cardinals. (Harry How, Getty Images)

The Arizona Cardinals have re-signed veteran linebacker Clark Haggans to a one-year deal, according to a release from the team. Haggans, 35, has played 12 years in the NFL, spending the last four with the Cardinals. He won Super Bowl XL in 2006 as a member of the Pittsburgh Steelers, who drafted him out of Colorado State University in 2000.

Haggans played all 16 games last season, recording 46 tackles and three sacks as the Cardinals finished with an 8-8 record. The Cardinals cut undrafted rookie Broderick Binns to make room for Haggans on their roster.