Soto was released by Chicago on Friday.
Soto was removed from the White Sox's 40-man roster Friday, Dan Hayes of CSN Chicago reports.
Soto was optioned to Triple-A Charlotte on Wednesday.
Soto was claimed off waivers by the White Sox on Monday.
Soto was claimed off waivers by the Athletics on Wednesday.
Soto was designated for assignment by the Cubs on Saturday.
Soto was traded to the Cubs on Monday in exchange for cash considerations, Mark Gonzales of the Chicago Tribune reports.
Soto was optioned to Triple-A Columbus on Wednesday.
Soto's contract was purchased from Triple-A Columbus on Thursday.
Indians prospect Giovanni Soto was hammered by the Reds in his spring debut on Friday, allowing five runs on three hits and a pair of walks in only 2/3 of an inning.
The 21-year-old lefty was acquired by the Tribe in July of 2010 when Jhonny Peralta was dealt to the Tigers. He posted a 3.93 ERA and 1.32 WHIP over 22 starts at Double-A Akron in 2012, while fanning 100 in 121 1/3 innings. He has an electric arm, but is still very raw and has to improve his command before he's a candidate to join the big league roster.