Olszewski went down with a groin injury in Thursday's practice and will be out for a while, Pat Leonard of the New York Daily News reports.
The 6-foot return specialist's groin injury ended up sidelining him for Saturday's 28-10 preseason loss against Houston. Olszewski was primed to potentially serve as the primary returner for the Giants, but Isaiah McKenzie took the reps during the preseason game and will likely continue to do so.