Trade for 2B Starlin Castro of the Marlins. He and Polanco are the middle infield. MLB Trade Rumors say the MArlins want to trade him and are looking for controllable pitching (them and everybody else). Castro is 28 and last three years are :
2016 - .270/.300/.433, 21 HRs, 93 OPS+ for the Yankees
2107 - .300/.338/.454, 16 HRs, 106 OPS+ for the Yankees
2018 - .286/.337/.409, 11 HRS, 111 OPS+ (so far) for the Marlins.
I would trade any of the AAA starters not named Romero or Mejia - Stewart, Gonsalves, Littlel, Slegers, De Jong - plus either a Busenitz/Duffy/Vasquez type reliever (anybody except Rogers, May or Hildenberger) or Gordon, or maybe even both. Either that or Mejia plus an A ball guy. Makes sense I think because Miami is 3-4 years away from any hope of contending and by then Castro will be on the downside, and the Twins hope their window is the next 3-4 years.