Feyereisen was optioned to the Brewers' alternate training site Monday.
Feyereisen made four relief appearances during his most recent stint in the majors, allowing five runs on three hits and five walks while striking out six over 7.1 innings during that time. However, his results faltered recently as he allowed four runs over 3.1 innings during his last two outings. The 27-year-old will return to alternate camp after Ray Black was reinstated from the 45-day injured list in a corresponding move.