| Date | Transaction |
| 02-28-2047 | John Colahan has retired from football. |
| 08-12-2046 | The Green Bay Packers have waived John Colahan. |
| 08-15-2044 | The Philadelphia Knights have moved John Colahan to the active roster. |
| 08-15-2044 | The Philadelphia Knights have acquired John Colahan from the waiver wire. |
| 08-08-2044 | The Las Vegas Thunderbirds have waived John Colahan. |
| 08-08-2044 | The Las Vegas Thunderbirds have moved Josh Craddock and Freddie Print to the active roster. The Las Vegas Thunderbirds have moved Clytus Black and John Colahan to the inactive roster. |
| 11-30-2043 | The Las Vegas Thunderbirds have moved John Colahan to the active roster. The Las Vegas Thunderbirds have moved Tim Moses to the inactive roster. |
| 11-30-2043 | The Las Vegas Thunderbirds have acquired John Colahan from the waiver wire. |
| 09-14-2043 | The San Antonio Texans have waived John Colahan. |
| 09-06-2043 | The San Antonio Texans have moved Mike Walker, Bob Otis, Bobby Covington, Paul Tubbs, Rondell Scott, Kevin Clark, and Andy Barrett to the active roster. The San Antonio Texans have moved Paul Belding, Lionel Denvir, John Colahan, Theo Fuller, and Jackie McClure to the inactive roster. |
| 08-30-2043 | The San Antonio Texans have placed John Colahan on the trade block. |
| 01-18-2043 | The San Antonio Texans have moved John Colahan to the active roster. The San Antonio Texans have moved Arnie Fausch to the inactive roster. |
| 01-18-2043 | The San Antonio Texans have acquired John Colahan from the waiver wire. |
| 09-08-2042 | The Atlanta Explosion have moved Toni Buggs to the active roster. |
| 09-08-2042 | The Atlanta Explosion have waived John Colahan. |
| 10-16-2039 | The Miami Buzz have moved John Colahan to the inactive roster. |
| 11-30-2037 | The Miami Buzz have moved John Colahan to the active roster. The Miami Buzz have moved Mike Chamberlain to the inactive roster. |
| 11-30-2037 | The Miami Buzz have acquired John Colahan from the waiver wire. |
| 10-05-2037 | The Baton Rouge Rogues have waived John Colahan. |
| 09-14-2037 | The Baton Rouge Rogues have acquired John Colahan from the waiver wire. |
| 09-07-2037 | The Tennessee Negans have moved Jim Anderson to the active roster. The Tennessee Negans have moved Ed Wathen to the inactive roster. |
| 09-07-2037 | The Tennessee Negans have waived John Colahan. |
| 09-07-2037 | The Tennessee Negans have moved Alexander McCormick, Steve Toney, Freddy Blockhead, Glen Olsen, and Twitch Ervin to the active roster. The Tennessee Negans have moved John Colahan, Earl Coleman, Leroy Green, and Joe McEndoo to the inactive roster. |
| 08-10-2037 | The Tennessee Negans have moved Mack Vrabel, Tim Hubach, Jim Anderson, John Colahan, Earl Coleman, and Kevin Anderson to the active roster. The Tennessee Negans have moved Scott Cheroke, Ben Carter, M.C. Boyer, and Wilbert Raiola to the inactive roster. |
Defensive Tackle