Bayern were comfortable 4-0 aggregate winners.
"If you win 2-0 away against Juventus it is an amazing result," Robben told uefa.com.
"They are a terrific team, the best in Italy, who are very strong at the back. It was a great performance from us.
"We knew we had won the Bundesliga already so now we can focus on the Champions League. We also have a German Cup semi-final coming up so we are in some big games."