The Pirates placed Palacios on the 10-day injured list Wednesday with a left hamstring strain, Noah Hiles of the Pittsburgh Post-Gazette reports.
Palacios made an early exit from Monday's game versus the Astros due to a hamstring injury, and it will now officially force him to miss at least the first portion of August. Bryan De La Cruz was officially activated to fill the open roster spot, and he figures to take over as Pittsburgh's primary right fielder.