Harrison was signed to the Colts' 53-man roster from their practice squad Monday.
The Colts released Harrison on Sunday, Tom Pelissero of NFL Network reports.
Harrison has played almost exclusively as a safety during Colts' mandatory minicamp, Nate Atkins of The Indianapolis Star reports.
Harrison re-signed with the Colts on a one-year contract Wednesday, Adam Schefter of ESPN reports.
Harrison tallied 20 tackles (11 solo), one sack, two passes defensed, two interceptions and one touchdown across seven regular-season games in 2023.
Harrison had an interception in Sunday's win over Tampa Bay but did not record a tackle.
The Colts signed Harrison to their active roster Tuesday.
Harrison is signing a one-year contract with the Colts on Monday, Adam Schefter of ESPN reports.
Harrison (hamstring) was a full participant at practice Wednesday, Zac Jackson of The Athletic reports.
Harrison (hamstring) was ruled out for the remainder of Thursday's game against Pittsburgh, Mary Kay Cabot of The Cleveland Plain Dealer reports.