It is the second straight week Richardson will be inactive.
The Colts are currently 7-point underdogs against the Patriots Sunday.
Nixon played 99 snaps on offense during the regular season, per Pro Football Focus, including all 65 offensive snaps in his team's Week 16 blowout loss to the Cowboys. The tackle was charged with surrendering one sack and three quarterback hurries in Week 16.
Indianapolis is a 6 1/2-point underdog against New England Sunday.
Shipley had been listed as doubtful, while Thornton had previously been ruled out.
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