Shepard is in the concussion protocol after being hurt in the season-opening 35-17 loss at Dallas. He was at practice Wednesday but did not participate.
Despite leading the Giants receivers in the preseason, Jones was cut on Aug. 31. To create room for him on the roster, Martin was placed on the IR list. He sprained a knee Sunday.
Jones spent the previous four seasons with Detroit, catching 64 passes for 814 yards and four touchdowns.
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