Leeds United lost 1-0 to Ipswich Town on Tuesday night, after putting in a disappointing performance.
Rosler has made it a priority to ensure that Leeds dominate the ball in matches, but they struggled against a well-drilled Ipswich Town side in their most recent match.
The Tractor Boys' pressing game stopped Leeds from getting on the ball as much as they would have liked, and drew them into playing long, which ultimately played a part in helping them to beat the Whites 1-0 at Elland Road.
It was a result that disappointed Rosler, and the German boss was keen to stress after the match that his side have to start making improvements to their play.
“In the second half I felt they drew us into their long-ball game, which they obviously did better than us," he said.
“They played the time down and some decisions went against us. Overall, it was a disappointing evening and we have to learn to play against teams who make it difficult for us to get on the ball.”
Prior to their defeat to Ipswich, Leeds had remained unbeaten in the Championship this term - with Rosler seemingly making his side very hard to beat.
However, their performance against Mick McCarthy's side was well short of the standard required, with the Yorkshire outfit struggling to create chances throughout.
It gives them plenty to work on over the remainder of the week, and Rosler will be hoping to see an improvement in Leeds' performance levels when they face MK Dons on Saturday.