The Nationals will call up Tetreault from Triple-A Rochester to start Tuesday's game against Atlanta, Matt Weyrich of NBC Sports Washington reports.
Tetreault has started 12 games for Rochester in 2022, turning in a 4.19 ERA, 1.29 WHIP and 52:24 K:BB across 58 innings. If he fares well Tuesday, he could be get a second turn through the rotation while Stephen Strasburg (neck) is on the 15-day injured list.