Andreoli and Junior Lake are the 2 I'm watching. For me it isn't that I don't believe in Heredia, it's that I believe he can improve with more time to work on things. He's hardly had any time in the minors yet his EYE is among the best on the team. It's what happens once he makes contact and what happens when he's on the bases that can improve.
Junior Lake spent 2012-15 in AAA mostly with the Cubs affiliate in Iowa hitting .299/.374/.425. 533 PA, 41XBH, 56 BB, 117 K. Iowa in 2014 had a PF of only 101 in contrast to most of the PCL. In 2013 it was also neutral, or slightly better for hitters than Cheney. At home he put up .330/.376/.543 in 2013. He's a Dominican like Cano, Cruz, Segura, etc. but then that didn't seem to help Marte. He isn't a plus CF, even though he has the speed but he started out as a SS/3b, moved to CF, played 1b and 2b at times and plenty of COF. Somehow nobody lists him as a Utility option. I see a potential Super-sub, even if it's not likely he's super. 27 with experience, you say? If he's your 4th OF and Motter or Romine, etc. is your other non-C on the bench then you could have the versatility needed to play with a short bench.