Marrero had been working back from a stint on the disabled list. Clearly, the organization decided not to bring him back onto the active roster. Marrero is out of options, so this was the only other choice.
Soon to turn 28, Marrero was picked up from the Red Sox just before the start of the season. Valued highly for his glovework, the former first-rounder has never come around with the bat. In 85 plate appearances this year, he managed only a .167/.224/.205 slash line, leaving him with a 39 wRC+ in 343 trips to the MLB plate over the past four seasons.