A hip injury and resulting surgery will keep free agent shooting guard
Fields played only 56 games over the last two seasons combined with Toronto. He averaged a career-low 1.8 points last year.
The power forward sustained the injury colliding with another player in a workout Wednesday and underwent surgery Thursday.
Martin, who was selected with the 25th overall pick in the 2015 draft, averaged 13.7 points and 6.9 rebounds over his last two seasons with LSU.
Ethier, whose knee is swollen, is available to pinch hit if necessary on Thursday.
In 34 relief appearances for the Padres in 2015, Garces has registered a 4.94 ERA over 31 innings.
But the Pirates recalled Hart from the rehab stint but will not activate him from the 60-day disabled list. Instead, he will head home to Arizona and prepare for the 2016 campaign.
Brought in by the Pirates on a low-risk, one-year deal, Hart had a forgettable 2015 season. He registered just 54 at-bats, collecting 12 hits--including a double and two home runs--in 35 games. The oft-injured slugger hasn't played more than 70 games since 2012 with the Brewers.
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