by Curtis Crabtree
KJR reporter
Twitter: @Curtis_Crabtree

RENTON - The Seattle Seahawks could be putting their defensive line depth to the test this weekend against the San Francisco 49ers.

The team announced Thursday they have placed DT Jason Jones on injured reserve with a knee injury. Jones did not practice and was listed on the injury report on Wednesday.

With Jones' season over, the team promoted DT Hebron Fangupo from the practice squad to the active roster. They also signed WR Bryan Walters to fill Fangupo's spot on the practice squad.

With DT Alan Branch dealing with an ankle injury as well, DT Greg Scruggs will likely see an incresed role with Jones out. Scruggs has played in 10 games this season for Seattle after being drafted in the seventh round in April's draft. He has seen time at multiple positions along the defensive line.

Fourth round pick DT Jaye Howard also will likely be more involved this week as well. Howard has only been active for one game this season. DT Clinton McDonald will continue to be heavily involved as well.

The good news for Seattle was Branch was able to return to full participation in practice on Thursday. Going against the San Francisco 49ers terrific offensive front, it would be a concern for Seattle to be down two key defensive line contributors heading into Sunday.

RB Marshawn Lynch and RB Leon Washington were full participants in Thursday's practice. Lynch was limited Wednesday with a back injury that has been on the injury report throughout the season. Washington missed Wednesday's practice with an illness.

CB Walter Thurmond and CB Marcus Trufant missed practice again Thursday with hamstring strains. S Jeron Johnson (groin) and RB Robert Turbin (illness) were both limited.

CB Richard Sherman was not at practice Thursday as he is apparently headed to appear at his appeal for the pending four-game suspension for a violation of the league's performance-enhancing drug policy. The appeal is expected to take place on Friday.

Injury Report:

San Francisco 49ers

Did Not Participate

LB Clark Haggans (shoulder)
DT Justin Smith (elbow)

Limited Participation

LB Ahmad Brooks (shoulder)
CB Tarell Brown (shoulder)
LB Tarvares Gooden (ribs)
WR Mario Manningham (shoulder)
LB Aldon Smith (shoulder)
FB Bruce Miller (shoulder)
DT Will Tukuafu (concussion)

Full Participation

K David Akers (pelvis)
G Alex Boone (knee)
LB Navarro Bowman (shoulder)
RB Frank Gore (wrist)
G Mike Iupati (shoulder)
CB Carlos Rogers (knee)
LB Patrick Willis (shoulder)
S Dashon Goldson (foot)

Seattle Seahawks

Did Not Participate

WR Sidney Rice (knee)
CB Walter Thurmond (hamstring)
CB Marcus Trufant (hamstring)
CB Richard Sherman (non-injury)

Limited Participation

S Jeron Johnson (groin)
RB Robert Turbin (illness)

Full Participation

RB Marshawn Lynch (back)
DT Alan Branch (ankle)
RB Leon Washington (illness)