When asked whether he was confident that an eventual settlement was likely to be lower than $46 billion, Mueller said: "I am not confident, but I hope of course because our calculations lead to different results. This $46 billion or any other figure at this point in time would be paramount to speculation and we will not comment on that," he said.
"I assume that the American authorities will be stringent but fair, so I believe that a figure that you have mentioned is much too high. But as I have stated I will not partake in speculation at this juncture and I assume that we will reach and amicable agreement," he added.
Shares traded over 2 percent higher on Monday, recovering from some weakness last week, following fresh data on European car sales. Registrations of Volkswagen brand cars slumped 4 percent in the wake of the scandal, according to the European Automobile Manufacturers Association. However, the VW Group as a whole saw a 1 percent rise in sales.