Chaparro went 2-for-2 with a double, three RBI and two runs scored during Saturday's 8-2 win over the Reds.
Alvarez did not factor into the decision Saturday against the Reds, allowing one run on three hits and one walk while striking out two across 5.1 innings.
Washington demoted Palmquist to Triple-A Rochester on Saturday.
Lord will start Sunday's matchup against the Reds, per Mark Zuckerman of NatsJournal.com.
Suarez went 1-for-3 with a walk and a two-run home run during the Reds' 8-2 loss to the Nationals on Saturday.
Burns (13-2) took the loss against the Nationals on Saturday, allowing five runs on six hits and three walks while striking out six across 5.1 innings.
The Reds optioned Petty to Triple-A Louisville on Saturday.
Cruz walked one and struck out one in a scoreless seventh inning Friday to record his first career hold in Friday's win over the Reds.
Lile went 2-for-4 with a double, a three-run home run and a second run scored in Friday's 5-3 win over the Reds.
Mey gave up two hits and struck out four over 2.2 scoreless relief innings in Friday's 5-3 loss to the Nationals. He didn't walk a batter.
