Komatsu, selected from the Nationals in last winter's Rule 5 draft, was designated for assignment on Tuesday by St. Louis. The 24-year-old appeared in 15 games for the Cardinals and saw time at all three outfield positions.
The Twins picked up Thomas off of waivers from Detroit less than a month ago. The 28-year-old saw time in twelve games for Minnesota and played mostly in right field. In parts of four Triple-A seasons with the Tigers, Thomas has a slash line of .252/.336/.409.