The Millers beat Derby 1-0.
The Derby boss has been speaking about his side’s visit to Rotherham.
The midfielder is back for a second loan spell at Rotherham.
Nobody has made more saves than the Slovakian so far this season.
Ball joined Bradford on loan on Monday
The Millers went out of the Carabao Cup
The Millers boss met with the media on Tuesday afternoon.
A look at some of Rotherham’s international players.
The Millers were beaten 3-2 by Hull.