New/old Seahawks’ RB Marshawn Lynch signed a deal for this year only – the last regular-season game and the postseason, per source.— Adam Schefter (@AdamSchefter) December 24, 2019MORE: NFL Power RankingsWhile it’s unclear whether Lynch still has any juice left in his legs, acquiring a fan favorite and longtime locker room fixture could at the very least serve as a morale boost heading into Sunday’s rivalry showdown against San Francisco.Expect a raucous ovation at CenturyLink Field when Lynch is introduced. The Seahawks brought back the most popular running back in franchise history Monday night, signing Marshawn Lynch to add depth to their depleted backfield.An agreement materialized after running back Chris Carson hurt his hip this past weekend, joining fellow ball-carriers Rashaad Penny and C.J. Prosise on the injured list. Lynch, 33, has not played in an NFL game since last season as a member of the Raiders, but he is expected to suit up for Seattle in Week 17 against the 49ers due to the team’s lack of options. Lynch spent six memorable years with the Seahawks from 2010-15. During that stint, he rushed for more than 6,000 yards and recorded 57 rushing touchdowns. He also won a Super Bowl with the team in 2013 and appeared in another in 2014.