Strasburg was in Washington over the weekend promoting a store opening.
Manager Matt Williams said Stephen Strasburg was ultimately reserved for "emergency-only" relief duty.
Matt Williams says Stephen Strasburg could pitch out of the bullpen in any role; Zimmermann would pitch on normal rest Thursday.
Stephen Strasburg had never thrown fewer curveballs, by percentage, in any career start than Friday.
The right-handed starter will make his major league debut on Friday and face off against Jake Peavy.
The Nationals will face the winner of Wednesday's Pirates-Giants wild-card game in the NLDS.
The Nationals aren't about to announce their playoff rotation, but Stephen Strasburg has made clear who will pitch Game 1.
For the first time in his career, the right-hander has reached that innings benchmark, a season milestone he long sought.
The right-hander has a 2.79 ERA over his past eight starts. He dealt with finger irritation on Friday.
Has Jose Lobaton become Stephen Strasburg's personal catcher? Matt Williams says it's a coincidence.