Ian Rapoport of NFL Network reported James Thrash, the league's appeals officer, made the ruling Tuesday. Lynch received the ban for making contact with an official during the team's Week 7 clash with the Kansas City Chiefs.
The 31-year-old back, who came out of retirement to play for his hometown Raiders this season, ran off the sideline during a confrontation between several Oakland offensive linemen and Chiefs cornerback Marcus Peters, who'd delivered a questionable hit on quarterback Derek Carr.
Peters, a fellow Oakland native and longtime friend of Lynch, said after the game he wasn't surprised to see the Raiders star run onto the field to help him, though it led to his ejection.
"They can say what they want, but one thing's for certain: Family do come first," Peters told reporters.
Jay Glazer of Fox Sports noted Peters testified for Lynch during the appeal hearing.
The running back is slated to lose his $79,411 game check for Week 8 as well as a $31,250 roster bonus for missing Sunday's contest with the Bills, per Scott Bair of NBC Sports Bay Area.
Jalen Richard and DeAndre Washington figure to split most of the backfield workload against Buffalo. Fullback Jamize Olawale could also see some touches in short-yardage situations.
Lynch will be eligible to return when the Raiders travel to Hard Rock Stadium to face the Miami Dolphins in Week 9.
🔥 Top Videos from Around B/R 🔥
Which Teams Are the Best Fit for Dez?
Johnny Football Is BACK!
Quavo's Mega-Celebrity Flag Football Game
Meet the NFL's Next Alshon Jeffery
Tremaine Edmunds Is NFL Draft No-Brainer
Grading the Rams' Deal with Suh
Meet the Undisputed Top CB in the NFL Draft
Grading Jordy Nelson's Deal with the Raiders
Grading the Kirk Cousins Contract
Grading the Allen Robinson Contract
Guice Is the Superstar Prospect to Remember
Simms: Lamar Jackson Is No.1 QB in 2018 Draft
Biggest Winners and Losers from NFL Combine
Where Will Jimmy Graham Land?
Simms: Barkley Is on a Different Planet
Where Would the Dolphins Trade Jarvis Landry?
Where Will Kirk Cousins Land?
Building the Perfect QB Prospect for the Draft
James Washington Is the Top Riser at WR for NFL Draft
Eagles Fans Celebrated Exactly as You Would Expect