Wilson elected to become a free agent Monday, Hunter Baumgardt of Fox Sports 920 Milwaukee reports.
He passed through waivers after being removed from the Brewers' 40-man roster, but Wilson has opted to test out free agency rather than accept an outright assignment to Triple-A Nashville. The swingman has made a total of nine appearances between three different teams in the majors this season, allowing 11 runs with an 18:2 K:BB over 23.1 frames.