The Colts said Monday that doctors have told Peyton Manning not to practice this week in advance of the season opener on Sunday as he continues to recover from offseason neck surgery. The team said in its statement that Manning's status against the Texans "will likely be doubtful." Manning's triceps strength has plateaued and he doesn't have the arm strength right now, sources told ESPN senior NFL analyst Chris Mortensen. Manning also had some back soreness that worsened during the weekend.