A lot of people were clamoring for Tyler Black a few weeks ago. Unfortunately, he has a .125 BA with a .323 OBP at Nashville (only 31 Plate Appearances, so yes, a small sample size). So Black is not likely going be to the guy.
Dorrian has been tearing it up at AAA lately, so he would be my choice, but he's not on the 40 man so I doubt it happens.
My guess is:
1. JB Bukauskas, Rea, or Teheren for the bullpen.
2. Jahmai Jones or Rowdy for a pinch hitter.