"Yea I'm piss watching the colts game when I should be out there, too. Even tho i didn't break no f----- team rules, not even," Rainey tweeted, via ESPN.com.
Rainey posted another tweet minutes later after running back Daniel Herron scored a touchdown.
"Nice TD Boom even tho u was in the hallway with me that nite when we was horsing around with the fire extinguisher. Man up like I did," Rainey tweeted.
Rainey deleted both tweets.
The 26-year-old running back signed with the Colts as a free agent last November, playing in two games and returning six kickoffs for 131 yards and four punts for 29 yards.
Rainey was a fifth-round pick by the Pittsburgh Steelers in the 2012 NFL draft.
- Scooby Axson