Middlesbrough manager Aitor Karanka has warned his players not to underestimate Rotherham United when they meet at New York Stadium on Tuesday night.

Boro currently sit just a point off leaders Burnley in the Championship table with a game in hand over the Clarets heading into the clash with relegation-threatened Rotherham.

However, the Millers have won their last two games to breathe new life into their survival hopes, and Karanka believes that it could prove to be one of his side's most difficult games of the season.

"For me it can be the most difficult game we have until the end of the season," Karanka told reporters.

"Everyone expects three points because Rotherham are in the bottom three and everybody thinks it will be an easy game.

"But for me it's a difficult game. They have won their last two matches and have an experienced manager in Neil Warnock."

Middlesbrough have lost just one of their last seven Championship outings.