Feliciano, 31, made his Major League debut last season after 13 years in the Minors, hitting .231 in 54 games with the Mets. He should rejoin Fernando Martinez, Kirk Nieuwenhuis, Lucas Duda and Jason Pridie in the outfield for Triple-A Buffalo.
Shelton, 30, is six years removed from a season in which he hit 18 home runs and slugged .510 in 107 games for the Tigers. Spending most of last season with Houston's Triple-A affiliate, Shelton hit .249 with 10 homers in 82 games.
Tsujimoto, 22, made his professional debut in the independent Golden League last season, finishing 3-2 with a 2.88 in 34 1/3 innings for Maui, striking out 48 batters and walking 13.
None of the three players received an invitation to big league camp.