Soto was removed from the White Sox's 40-man roster Friday, Dan Hayes of CSN Chicago reports.
The left-hander was optioned to Triple-A earlier in the spring, but the White Sox needed room on the 40-man roster in order to add Anthony Swarzak to the major-league relief corps. Despite the demotion, Soto did piece together a decent spring performance, so he could climb back to the big leagues later in the season if he performs well in the minor leagues.