Boss Owen Coyle believes Rotherham will be a different side to the one that Rovers defeated back in September.
Rovers ran out 4-2 winners at Ewood Park, but as they go to the ASSEAL New York Stadium in search of a league double this afternoon, the manager knows the Millers are a tougher proposition on their own patch.
"Rotherham have won a few of their games at home so we've got to be ready for that," said Coyle.
"And the games they have been involved in recently have been really tight. They lost 1-0 at Bristol City last week. I've watched it back and it was a tight game and could have gone either way. They also lost 1-0 at home to Barnsley.
"So they are always tight games in the Championship.
"But what I know is that if we are at our best then that is a game that we can go and win, so we've got to be ready and focussed to do that."
Tickets for this afternoon's match at Rotherham will be on sale from the away box office, cash only from 1.30pm.
Prices are £25 for Adults, £15 for Seniors 60+, £15 Students (must produce valid proof of full time education), £15 for 18-21s, £9 for Under 18s and £2 for those aged 12 and under.