"Football is like that and mistakes happen," Kalac told La Gazzetta dello Sport.
"I don't know whether I will be first choice when the season starts but I hope so. It's not now that I need to be in form."
While Kalac is struggling, Abbiati impressed in the Trofeo TIM, where he was the hero against Inter in a penalty shoot-out.
"He is making good saves but I don't fear competition," Kalac insisted. "I am just thinking about training well and stopping shots.
"It wouldn't be fair to judge me on the disaster in Moscow and I am ready to bounce back."