Clark Haggans reportedly poised to sign with 49ers

The San Francisco 49ers are poised to sign former Arizona Cardinals and Pittsburgh Steelers outside linebacker Clark Haggans, Matthew Barrows of the Sacramento Bee reports.

According to Barrows, Haggans will take a physical on Sunday and, if everything checks out, will be signed to the 53-man roster.

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A fifth-round draft pick out of Colorado State by the Steelers in 2000, Haggans has been a full-time starter in seven of his last eight seasons, totaling 46.5 sacks, including three last season with the Cardinals, who had signed the 6-foot-4, 243 pounder in 2008.

The Cardinals re-signed Haggans to a one-year contract in June to provide veteran depth behind projected starters O'Brien Schofield and Sam Acho, but released the veteran as part of their cuts down to a 53-man roster Friday.

Veteran depth is what Haggans would bring to the 49ers, who may be without Parys Haralson, the only backup behind Ahmad Brooks and Aldon Smith, for the season-opener against the Green Bay Packers.

Haggans, 35, can still play. According to official playing-time documents, Haggans logged nearly 75 percent of the Cardinals' defensive snaps last season and, according to the Football Outsiders Almanac, had 15 hurries.

Follow Brian McIntyre on Twitter @brian_mcintyre.