Dunn went 2-for-3 with a solo home run, a walk, two stolen bases and three total runs scored in Thursday's 15-3 loss to Atlanta.
The Reds recalled Dunn from Triple-A Louisville on Monday.
The Reds optioned Dunn to Triple-A Louisville, Gordon Wittenmyer of The Cincinnati Enquirer reports.
Dunn started in center field and went 0-for-2 with a strikeout in Sunday's 5-1 loss to the Tigers.
Fairchild is out of the lineup for Sunday's game against the Tigers.
Dunn started in right field, batted ninth and went 0-for-3 in Wednesday's 3-2 win over the Yankees.
The Reds recalled Dunn from Triple-A Louisville on Wednesday, Gordon Wittenmyer of The Cincinnati Enquirer reports.
The Reds optioned Dunn to Triple-A Louisville on Thursday.
Dunn started in left field and went 1-for-4 with a double and a run scored in Friday's 3-2 win over the Cubs.
Dunn started in left field and went 0-for-2 with a run scored in Tuesday's 4-1 win over the Rockies.