Johnson was signed to the Colts' 53-man roster Saturday.

Johnson will take the roster spot of disappointing wide receiver Deon Cain, who was waived in a corresponding move. It's unlikely Johnson makes much of an immediate impact, but the Colts will be without two of their key pass catchers in T.Y. Hilton (calf) and Parris Campbell (hand), making the fourth-year wideout No. 4 on the team's depth chart.

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