The Bayern Munich defender said the Bundesliga giants need to change their approach to get back to winning ways after a home draw against Ajax.
Bayern Munich must cut out the careless mistakes if they are to end a three-game winless streak, according to Joshua Kimmich.
After a draw with Augsburg and defeat to Hertha Berlin in the Bundesliga, Bayern were held 1-1 by Champions League rivals Ajax at the Allianz Arena on Tuesday.
Mats Hummels' early goal should have been the platform to make it two wins out of two in Group E, but Ajax levelled midway through the first half through Noussair Mazraoui.
The Dutch side had chances to win the game after the break as Bayern continued to struggle in the final third, leaving the hosts frustrated at the final whistle.
And while Thomas Müller and Arjen Robben urged caution, Kimmich warned that something must change if they are to arrest their recent slump in form.
"We scored the early goal, but then we became reckless," Kimmich told reporters. "We became careless, made many mistakes and put the opponent into the game.
"Then we also had phases where we had lots of the ball but little ideas. We have to do more to push the opponents back and develop pressure phases.
"Things have to change now. We have to be better at dominating the opponents and not repeat such mistakes again and again.
"It's not about commitment or fitness, it's just that we have too many mistakes in our game."
Bayern welcome Borussia Mönchengladbach to Munich on Saturday as they return to Bundesliga action.