Here's my list of active MLB players who actually played a regular season game for the Twins:
Liam Hendriks (CWS), Jonathan Schoop (DET), Robbie Grossman (DET), Rich Hill (BOS), Hansel Robles (BOS), Josh Donaldson (NYY), Marwin Gonzalez (NYY), Aaron Hicks (NYY), JT Chargois (TAM), Matt Wisler (TAM), José Berríos (TOR), Jake Odorizzi (HOU), Jason Castro (HOU), Niko Goodrum (HOU), Kurt Suzuki (LAA), Sergio Romo (SEA), Martín Pérez (TEX), Mitch Garver (TEX), Eddie Rosario (ATL), Trevor May (NYM), Eduardo Escobar (NYM), Kyle Gibson (PHI), Nelson Cruz (WAS), Sean Poppen (ARI), Alex Columé (COL), Tyler Kinley (COL), CJ Cron (COL), Brusdar Graterol (LAD), Taylor Rogers (SDP) and Zack Littell (SFG).
Several ex-Twins started the season the the Injured List included Andrelton Simmons, Ben Rortvedt, LaMonte Wade Jr., Ehire Adrianza and Lance Lynn, Brent Rooker is not listed on San Diego's active roster, so he must have been optioned to AAA.