Weems will serve as the 27th man for the Nationals in Saturday's doubleheader against the Pirates, Jesse Dougherty of The Washington Post reports.

EDGE Analysis

It's an extra bullpen arm for the Nats in the twin-bill versus Pittsburgh. Weems, 30, has posted a 1.93 ERA with 13 strikeouts through 9.1 innings this season at Triple-A Rochester.