The Mets placed Vientos on the 10-day injured list Friday with a fractured right hand.
Vientos suffered the injury during Thursday's game against the Royals when he was hit by a Michael Wacha pitch. He is expected to be sidelined 6-to-8 weeks, per Chelsea Janes of SNY.tv, so Vientos will likely be unavailable for the Mets until at least late August.