ESPN also said Monday that perfect-game pitcher Dallas Braden is set to become a studio analyst for the nightly show.
The opinionated Guillen last managed with the Marlins in 2012. He will be part of the ESPN crew throughout the season and work with Sunday Night Baseball on ESPN Deportes.
Wedge will be on ESPN television and radio after managing Seattle last year. He is scheduled to make his debut today on a spring training game telecast.
Braden threw a perfect game for Oakland in 2010, and last pitched in the majors in 2011.
ESPN will take its pregame show “Baseball Tonight: Sunday Night Countdown” on the road several times this season, starting at Petco Park on March 30 when the Los Angeles Dodgers visit San Diego.
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