Fields, who turns 25 in January, hit .228/.335/.367 in 122 games in a repeat season at Triple-A in 2015, starting 91 games in center field and 24 games in left. The left-handed hitter walked 66 times and struck out 146 times, and stole 17 bases in 24 attempts in Triple-A.
Detroit drafted Fields in the sixth round in 2009.
Baseball America rated Fields as the top defensive outfielder in the Tigers' system last offseason.
He was called up to the Tigers in June and got into one game, going 1-for-3 with a double and a run scored. But after hitting .271/.394/.486 in 48 games in Triple-A before his call up, Fields struggled after he returned to Toledo, going 5-for-60 after getting sent down and hitting .200/.293/.289 over his final 74 games.
The Tigers designated Fields for assignment in September and he was claimed by the Brewers.
Fields had an injury history in the minors, as described by Lynn Henning of the Detroit News in April 2015:
A torn abdominal muscle that messed up his 2012 season, a concussion in 2013, and then, last year, a fractured thumb that slashed two months from what stood to be meaningful time for an outfielder the Tigers could soon need.
During his brief three-day major league stint, Fields was lauded by then-GM Dave Dombrowski, to Matthew Mowery of the Oakland Press:
"He’s been a guy that we’ve liked a great deal, but unfortunately for him, he’s had a lot of injuries in past years. Normally one of those freakish things that happens at times to players," Tigers GM Dave Dombrowski said when the Tigers brought Fields up on Tuesday. "But this year’s been the first time in many years he’s stayed healthy from the beginning of the season."
Fields has all of three days of major league service time, and has one option year remaining, having used options in 2014 and 2015.
With Fields, the Dodgers now have 38 players on their 40-man roster.