Wendelken signed a one-year deal with the Yokohama BayStars of the NPB on Sunday, Jon Heyman of the New York Post reports.
Wendelken elected free agency Oct. 11, per the MILB transaction log.
The Diamondbacks outrighted Wendelken to Triple-A Reno on July 11.
Wendelken was designated for assignment by the Diamondbacks on Tuesday.
Wendelken (undisclosed) was reinstated from the COVID-19 injured list Saturday.
Wendelken was placed on the injured list for an undisclosed reason Thursday.
Wendelken issued two walks over one-third of an inning in Tuesday's 2-1 loss to the Astros.
Wendelken agreed to a one-year, $835,000 contract with the Diamondbacks on Tuesday, avoiding arbitration, Zach Buchanan of The Athletic reports.
Wendelken (4-3) earned the win in relief Sunday against Colorado after tossing a scoreless inning, allowing one hit and a walk.
Wendelken saved Thursday's victory against Atlanta, tossing a scoreless ninth inning to lock down a 6-4 lead.