Chaparro will start at first base and bat seventh in Sunday's game against the Marlins.
Straw will start in center field and bat ninth in Sunday's game against the Yankees.
Gimenez (hamstring) is out of the lineup for Sunday's game against the Yankees.
Sanchez is out of the lineup for Sunday's game against the Yankees.
Abrams (ankle) is out of the lineup for Sunday's game against the Marlins, Mark Zuckerman of NatsJournal.com reports.
Lord struck out a batter and allowed no hits and one walk over 2.2 innings in a start during Friday's 3-2 loss to the Marlins.
Dion struck out four and allowed one hit and two walks over three innings in Friday's 3-2 loss to the Marlins.
Irvin (2-8) took the loss Saturday, giving up four runs on six hits and two walks over six innings as the Nationals fell 4-2 to the Marlins. He struck out four.
Springer went 3-for-5 with an RBI in Saturday's 4-3 win over the Yankees.
Cease (8-5) picked up the win Saturday, allowing one run on two hits and five walks over 6.2 innings in a 4-3 victory over the Yankees. He struck out eight.
