Andrelton Simmons is out of the lineup Monday after getting hit on the forearm by a pitch during Sunday's game.
Rougned Odor is doing agility drills on the field as he continues his recovery from a left hamstring strain.
The Nationals have promoted top prospect Juan Soto to High-A Potomac.
Mariners acquired LHP Roenis Elias from the Red Sox for a player to be named or cash.
White Sox transferred RHP Danny Farquhar (brain) to the 60-day disabled list.
Carson Fulmer is starting on Monday against the Mariners.
White Sox purchased the contract of RHP Chris Beck from Triple-A Charlotte.
White Sox placed RHP Miguel Gonzalez on the 10-day disabled list retroactive to April 19 with right shoulder inflammation.