- The Colts also parted ways with CB Jalil Brown, OT Jamon Meredith and waived FB Stanley Havili from the PUP list with a failed physical.
- Indy also signed WR Eric Thomas to the practice squad and released WR Chandler Jones from the practice squad.
Landry was suspended four games for violating the NFL policy on performance enhancing substances back in September.
Landry, 29, signed with the Colts as an unrestricted free agent back in 2012. He received a four-year, $24 million contract that included $11 million guaranteed. He still has three years remaining on his contract with base salaries of $3 million (2014), $3.5 million (2015) and $4.5 million (2016) coming his way.
So far this season, Landry has recorded 23 tackles and a sack over the course of four games.
Nixon, 24, was placed on injured reserve with the designation to return just days before the start of the regular season due to a knee injury.
The Colts signed Nixon as an undrafted free agent out of Florida last year. He appeared in four games for them during his rookie season.