Chelsea wrapped up top spot in Group G in impressive fashion, with John Terry, Willian and a Jan Kirchhoff own goal putting them in total control well before half-time.
The second period lacked the same sparkle, but substitutes Didier Drogba and Ramires completed the rout in Germany.
"They played a fantastic match," Mourinho told Sky Sports. "At this moment, this team is very mature and very confident.
"To win 5-0 away in the Champions League is not normal, playing away in Germany it is even less normal.
"The performance was very impressive. Every player individually and the team as a whole was very complete."
"We are defending well because we are defending with 11 players," added Mourinho. "We are attacking well because we are very confident in ourselves. We are a good team.
"Obviously, we can lose and maybe a bad result is waiting for us, but we are playing very well, we have big self-belief and the team is very confident.
"It's also very important for us to have one match against Sporting where we don't need the points, especially in December, which is a very busy month."
