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SANTA CLARA – The 49ers are fearing the worst for one of their rookie wide receivers. Shawn Poindexter, who, while not expected to make the roster, has had some flashes of brilliance in the preseason, will have X-rays to reveal whether he tore his ACL, as the 49ers believe is the case. Poindexter went down in the second half on his first and only snap of the game and had to be helped off on an athletic cart.

As head coach Kyle Shanahan said on Monday, the expectation is that Poindexter will come back with a torn ACL. Once those results come back, Shanahan said, the team will re-sign wide receiver Chris Thompson who was signed and then quickly cut to make room for defensive lineman Jeremiah Valoaga when the 49ers’ defensive line ran into injury trouble before the team’s first preseason game against the Dallas Cowboys.