McNichols (concussion) wasn't spotted at Thursday's practice, Jim Wyatt of the Titans' official site reports.
McNichols has now missed consecutive practices, putting his status for Sunday's game against the Texans in doubt. D'Onta Foreman and Adrian Peterson are in line to split early-down snaps in Tennessee's backfield against Houston, though it's not clear which running back would absorb the passing-down duties normally occupied by McNichols should he sit Sunday.