This is unlikely to change what the 49ers do in next week's draft.
The Seahawks will lose restricted free agent tackle Garry Gilliam, who signed a one-year offer sheet from the San Francisco 49ers on Monday.
But when Sowell struggled, Gilliam returned to the starting lineup for the final two regular season games as well as both playoff games.
He won the right tackle job in 2015 when the Seahawks chose to move Justin Britt to guard and started all 16 games and both in the playoffs. It comes cheap and creates competition during camp.
Clement expects either Swansea or Hull to be relegated
Watford manager Walter Mazzarri also makes three alterations, despite the Hornets winning their last two fixtures in the top flight.
If nothing else, the pursuit of Gilliam could give the 49ers three offensive tackles with significant starting experience.
With Gilliam out of the picture, the Seahawks will have to rework an already questionable line. Seattle general manager John Schneider told Seattle-area reporters at the recent owners meetings that Germain Ifedi, the team's first-round draft pick a year ago, would move from right guard to right tackle this season. With two different regimes making upgrades, offensive line has received as much attention as any position group on the roster the last two offseasons. The team acquired Jeremy Zuttah in a trade with the Baltimore Ravens.
Seattle reportedly will receive no compensation for Gilliam, who entered the league as an undrafted free agent in 2014.
The 26-year-old appeared in 14 games for the Seahawks last season, starting 13 at right tackle.