The 49ers will be severely undermanned at wide receiver against the Arizona Cardinals, with Jauan Jennings ruled out because of ankle and shoulder injuries.

Jennings’ absence and that of rookie Jordan Watkins, who is yet to play since the preseason opener and will be out several more weeks with a calf issue, leaves the 49ers with Ricky Pearsall, Kendrick Bourne, Marquez Valdes-Scantling, Skyy Moore and Malik Turner as their wideouts against Arizona. Turner was elevated from the practice squad for the game.

The injuries at receiver are exacerbated by George Kittle’s continued absence with a hamstring injury that led him to be placed on injured reserve.

But the worsening situation at a position where the 49ers remain without Brandon Aiyuk also places greater emphasis on the pass-catching

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