On the day guard Evan Mathis met with reporters following his signing a five-year contract with the Eagles, the team announced the additions of two other interior linemen.
They agreed to terms with Mike Gibson last week, but did not finalize the two-year deal until today. Gibson, 26, is back for his second stint in Philadelphia. Drafted in the sixth round of the 2008 draft, he left for Seattle in 2009.
In 2010, Gibson (6-foot-3, 298 pounds) started in eight games at guard. He appeared in the final three games of last season.
The Eagles also signed center/guard Steve Vallos to a one-year contract. He spent four seasons with the Cleveland Browns (2010-11) and Seattle Seahawks (2008-09), playing in 40 games and starting in eight. Vallos, 27, was orginally drafted in the seventh round by Seattle.