McDonald (6-foot-2, 295 pounds) was among the final roster cuts by the Seahawks two weeks ago. He was first acquired by Seattle in a 2011 trade with the Cincinnati Bengals. McDonald played in 29 games for Seattle, including one start, in the previous two seasons.
Person (6-4, 300) was a backup offensive tackle, but worked as the team’s third tight end in the season opener. However, Seattle signed veteran tight end Kellen Davis earlier this week.