McQuistan, 30, started 14 games last season for the Seahawks -- six at left guard and eight at left tackle -- while Russell Okung was out with a foot injury.
McQuistan returned to guard when Okung came back, but McQuistan did not start any of the three playoff games. He signed with Seattle as a free agent in 2011 and started every game in 2012.
But McQuistan counted $3.4 million against the salary cap in 2013, so it was unlikely the Seahawks were interested in re-signing him. The coaches are high are two 2013 rookies -- Michael Bowie and Alvin Bailey -- to step in and play regularly in 2014. It’s also likely the team will select an offensive lineman early in the 2014 draft.