Rotherham have signed Arsenal goalkeeper Emiliano Martinez and Charlton defender Lawrie Wilson on loan until the end of the season.
Martinez, 22, has made six appearances for the Gunners this season, the most recent at Stoke in December.
Wilson, 27, has played 27 games for the Addicks this term, but has not featured in their last three games.
Both players could make their debuts for the Millers in Saturday's Yorkshire derby against Sheffield Wednesday.
Steve Evans' side are 20th in the Championship, six points clear of the relegation zone with eight games left.