The 27-year-old's current deal at the Allianz Arena expires in 2013.
"This [contract extension] is a formality," the Dutchman told Suddeutsche Zeitung. "If there were five or ten clubs as big as Bayern, then you could say, 'Okay, I might have another goal.'
"But Bayern are already at the top, this is one of the best clubs in the world."
Robben joined Munich from Real Madrid in August 2009 for around £21m.