Four Seahawks appeared on the first official practice report of the 2015 season. 

For Seattle, linebacker Mike Morgan has already been ruled out for Sunday's game. Morgan suffered a hamstring setback in the team's third preseason game and didn't play in the exhibition finale.

Quarterback Tarvaris Jackson, who suffered a high-ankle sprain in the preseason opener, was a limited participant Wednesday, but coach Pete Carroll has said he thinks the team's backup quarterback will be ready for the regular season opener.

View: Week 1 Injury Report

As we've grown accustomed to seeing early in each game week, Marshawn Lynch's limited participation Wednesday wasn't injury related. The Seahawks like to rest the running back whenever possible to compensate for the heavy workload he'll receive throughout the year.

Of note for the Rams, 2015 first-round draft pick (No. 10 overall) Todd Gurley isn't expected to play this weekend, but the running back was listed as a limited participant at Wednesday's practice. Tre Mason, the team's leading rusher last season, did not participate Wednesday with a thigh injury.

Here's the official list for the Seahawks and their Week 1 opponent:

Seattle Seahawks

Out

LB Mike Morgan (Hamstring)

Limited Participation in Practice

TE Cooper Helfet (Knee)

QB Tarvaris Jackson (Ankle)

RB Marshawn Lynch (Not Injury Related)

St. Louis Rams

Did Not Participate in Practice

RB Tre Mason (Thigh)

LB Daren Bates (Knee)

Limited Participation in Practice

RB Todd Gurley (Knee)