CINCINNATI -- The Reds placed two more players on the 15-day disabled list on Monday.
During Sunday's 4-1 win over the Pirates, outfielder Chris Dickerson severely sprained his left ankle while trying to get back to first base during a pickoff attempt in the third inning.
Catcher Ryan Hanigan was hit in the mask by a foul tip off the bat of Delwyn Young in the eighth inning and was diagnosed with a concussion.
To take the open spots on the 25-man roster, the Reds will select the contracts of outfielder Darnell McDonald and catcher Corky Miller from Triple-A Louisville.
The Reds, who also lost starting pitcher Aaron Harang over the weekend to a season-ending emergency appendectomy, currently have 11 players on the DL.
In 96 games this season, Dickerson is batting .277 with two home runs and 15 RBIs. Hanigan is batting .272 with two homers and nine RBIs in 74 games.
McDonald opened the season with the Reds but was designated for assignment in May after he batted .175 in 24 games. He was batting .314 in 73 games for Louisville. Miller, who batted .274 in 27 games this season with Louisville and the White Sox Triple-A club in Charlotte, played for the Reds from 2001-04.
Corresponding 40-man roster moves to make room for McDonald and Miller will be announced on Tuesday.
Mark Sheldon is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.