The 33-year-old Simon went 15-10 with a 3.44 ERA and 127 strikeouts in 196 1/3 innings as a full-time starter last season. He made his first All-Star team in 2014.
In his first two seasons with the Reds, Simon worked out of the bullpen, primarily as a setup man. He spent his first four seasons with the Baltimore Orioles before being claimed on waivers by Cincinnati during the 2012 season.
Suarez, 23, hit .242 with four home runs and 23 RBI in 85 games last season with Detroit.
Crawford was the team's first round pick (No. 20 overall) in the 2013 MLB draft and has a 8-5 record with a 2.73 ERA in 31 minor league starts.
- Scooby Axson