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The 25-year-old was non-tendered by the Reds earlier in December and became a free agent.
In 18 appearances for the Reds last season, including two starts, Sampson posted a 4.35 ERA with 27 walks and 42 strikeouts in 39 1/3 innings. He fared better in 18 outings in Triple-A, nine of which were starts. He had a 1.88 ERA, 21 walks and 62 strikeouts in 62 1/3 innings.
Sampson was a fourth-round pick by the Padres in the 2009 Draft who was selected off waivers by the Reds in January 2015.
David Adler is a reporter for MLB.com based in New York. Follow him on Twitter at @_dadler. This story was not subject to the approval of Major League Baseball or its clubs.