Leeds United are currently in 16th place in the Championship table, having made a poor start.
The Whites have won just once in their last five matches, with Birmingham City beating them 2-0 in their latest outing at Elland Road.
That result means that Leeds have now not scored in three of their last four games, but Rosler doesn't believe that bringing in more players is an option.
"It was a bad day at the office," he said to Sky Sports after the Birmingham defeat. "I am not panicking or asking for two or three fresh players. That would be wrong. We have to come up with the answers collectively in the dressing room.
"The players want to do well, they prepare well and train well but for some reason we don't get the best from them at Elland Road."
Leeds have already been active in the transfer window this season, and they recent acquired Will Buckley on loan from Sunderland.
However, the winger did not make the desired impact on his debut, with Birmingham dealing with their attacking threat with ease.
The Blues are well drilled under Gary Rowett, but the way they limited Leeds gives Rosler a lot to ponder over the international break.
Leeds' loss to Birmingham sends them down to 16th in the Championship table, and they still only have two wins to their name all season.