It isn't news that running back and reigning Offensive Player of the Year Christian McCaffrey is a key cog in the 49ers' offensive system.

It also isn't news that his return should provide a substantial boost for a San Francisco offense that's been struggling to find the end zone without him in 2024.

New developments coming out of the team's Week 7 loss to the Kansas City Chiefs highlight just how important McCaffrey's return will be for the 49ers.

Head coach Kyle Shanahan on Monday in a conference call with reporters confirmed that wide receiver Brandon Aiyuk tore his ACL and MCL in Sunday's loss. He also said tight end George Kittle is day-to-day with a foot sprain, and WR Jauan Jennings is still dealing with a hip injury that held him out of Week 7. WR Deebo Samuel is also hospitalized with pneumonia and his timetable for a return is unknown.

Shanahan also mentioned in his conference call that the team hopes to get McCaffrey back right after their Week 9 Bye.

Even if Kittle, Jennings and Samuel are all back by that Bye week, McCaffrey's presence will be a massive help for the offense without Aiyuk in the lineup. Aiyuk is the only receiver the 49ers have who consistently separates against man coverage, and he's a threat in all three levels of the passing game.

Having McCaffrey back will help Shanahan better manipulate defenders and open space for some of the other playmakers who made need some scheme assistance to get open and operate in the spaces they're used to operating in.

There was never a point in the year where the 49ers weren't going to need McCaffrey back, but their dire injury situation makes his return even more vital if San Francisco wants to make the playoffs and make noise when they get there.

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This article originally appeared on Niners Wire: 49ers injury news underscores need for Christian McCaffrey return