The Bavarians have racked up 20 goals in their last three games, having routed Hoffenheim 7-1, Basel 7-0 and Hertha Berlin 6-0 over the course of the past ten days.
However, Robben is expecting Bayern's recent goal glut to come to an end in Monchengladbach.
"I can say right now, it will not be six or seven goals," the Dutchman told Goal.com at a press conference on Tuesday.
Indeed, the former Real Madrid ace feels that there is so little to choose between the two sides that he can foresee the game being decided by a shootout.
"But if it comes down to it, then we are ready for penalties," the Netherlands international declared.
Turning his attention to matters off the field, Robben's future with the club has been the subject of much debate of late.
However, while he was reluctant to discuss the matter at great length, the winger insisted that he is ready and willing to sign a new deal and denied rumours that he has held talks with other clubs.
"There have been two or three meetings," the 28-year-old revealed. "The contract extension is only a matter of time and I'm in no hurry.
"But the Gladbach game is the important thing right now; nothing else. I'm not talking to other clubs."
Robben, who has been capped 53 times by his country, arrived at the Allianz Arena from the Santiago Bernabeu in 2009.
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