Denard Span (concussion) could return from the concussion disabled list on Saturday.
Dan Kolko on Twitter
Span first has to make it through rehab games on Thursday and Friday. He was placed on the 7-day concussion disabled list April 12 after a collision with Braves infielder Dan Uggla. All reports so far have been good.
Doug Fister (lat) headed to extended spring training in Viera, Florida on Wednesday.
James Wagner on Twitter
Fister will begin working on a five-day throwing schedule, beginning with two simulated innings on Thursday. He'll then throw three simulated innings five days after, and a rehab assignment could follow that workout. Fister should join the Nationals around early May and will be a front-line fantasy starter once he is activated.
Peacock opened the 2014 regular season in the Houston bullpen but will take over the rotation spot left vacant by Lucas Harrell, who was designated for assignment after getting rocked Tuesday by the Royals. Peacock is not good fantasy option, even with the upgraded role.