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SANTA CLARA,CA (AP) - Clark Haggans joined the San Francisco 49ers at practice Tuesday pledging to hit the ground running with a team that fits the rugged style he has established throughout a 13-year NFL career.

The veteran outside linebacker, signed by the 49ers on Monday, will learn soon if he'll be available to play in Sunday's season opener against the Green Bay Packers.

Haggans faces discipline by the league after serving jail time in June after pleading guilty to DUI charges stemming from an April 2011 incident. His hearing before the NFL is scheduled Wednesday.

The 49ers certainly could use the services of the veteran with 46.5 career sacks when they face the Packers and a prolific passing attack led by quarterback Aaron Rodgers.