Niklas (ankle) was listed as non-participant during Wednesday's practice, Darren Urban of the Cardinals' official site reports.
Niklas sustained the ankle injury during Sunday's 20-15 loss to the Redskins, interrupting what had been his best outing of the season (three catches for 41 yards). He'll likely need to practice in some capacity Thursday or Friday in order to gain clearance to play in Sunday's game against the Giants.