Among the Seahawks’ eight starters who were free agents, left tackle Russell Okung is the only one whose status remains uncertain. Meanwhile, the Seahawks have signed three linemen in two days.

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As they continued to wait for a decision from left tackle Russell Okung, the Seahawks on Monday added two linemen, the first two players they have acquired during the NFL’s free agent signing period who did not play for Seattle last season.

Update: Seattle on Tuesday added yet another lineman, signing free agent guard J’Marcus Webb. This post was written before the Tuesday signing.

The Seahawks signed offensive lineman Bradley Sowell, who played the past four years with NFC West rival Arizona, and defensive lineman Sealver Siliga, who had a brief stint with Seattle in 2013 but has played most of the past three years with the Patriots.

Both were signed to relatively inexpensive and low-risk one-year deals.

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Sowell, who started 12 games at left tackle for Arizona in 2013 but has been a reserve the past two years, signed for $1.5 million.

Siliga, who has been a part-time starter the past two years, signed for $1.4 million.

Sowell did not play in 2014 and played just 33 snaps last season.

The Seahawks are uncertain about Okung’s future, and they have lost starting guard J.R. Sweezy and backup guard/tackle Alvin Bailey in free agency. Sowell is the first of what figures to be a handful of additions to replenish the line.

Though Sowell has been a starter at left tackle — and the Seahawks’ statement listed him as a tackle — a league source said his signing was not an indication of Okung’s situation. He spent the day mulling his next move after recently visiting the Giants, Lions and Steelers. He also is considering an offer from the Seahawks.

It was reported that Okung was scheduled to have another discussion Monday with Pittsburgh offensive-line coach Mike Munchak, which appeared to be an indication of increasing interest by Okung in the Steelers. But as of Monday evening there was no word on a decision from Okung or if one was imminent.

If Okung gets away, the Seahawks might need to turn their attention to signing some of the other available free agent left tackles. That includes Pittsburgh’s Kelvin Beachum, who visited Jacksonville on Monday but left without signing, and Oakland’s Donald Penn, who has not been reported to have visited anywhere but said last week on the NFL Network that the Seahawks would be an option if they need to replace Okung.

The Seahawks also could wait to see if other left tackles become available later via free agency or trade, or they could fill out the line in the draft — or a combination of both.

But for now, the Seahawks might be waiting to see what happens with Okung before striking again.

Okung, the first draft pick of the Pete Carroll/John Schneider era at No. 6 overall in 2010, is representing himself and was unable to talk to teams until the signing period began Wednesday.

Among the Seahawks’ eight starters who were free agents, Okung is the only one whose status remains uncertain. The Seahawks lost linebacker Bruce Irvin (Oakland), Sweezy (Tampa Bay) and defensive tackle Brandon Mebane (San Diego) and re-signed receiver Jermaine Kearse, cornerback Jeremy Lane, defensive tackle Athyba Rubin and punter Jon Ryan.

Okung could be seeking a contract that would pay as much as $10.5 million a season. But he had shoulder surgery in February to repair a dislocation suffered in the divisional playoff loss at Carolina, which could be impacting his offers.

Okung, Penn and Beachum are generally considered the top three left tackles who remain unsigned, and a decision by one could trigger movement on the others.

Siliga, meanwhile, was signed with the hope he can help replace Mebane as a run-stuffing nose tackle.

The 6-foot-2, 325-pounder who played in college at Utah was originally acquired by Seattle in August 2013 in a trade for offensive lineman John Moffit.

He was released in the final cutdown before that season, then re-signed to the practice squad before he was released from the practice squad and signed with the Patriots.

He started 13 games for the Patriots the past three seasons and was a starter for New England in its Super Bowl XLIX win over the Seahawks. He was on the field as part of the team’s goal-line package on the Seahawks’ fateful final offensive play.