Reigning champions Madrid made to work hard before beating VfB Stuttgart 3-1 at the Santiago Bernabeu.

Kylian Mbappe marked his first game in the competition with Real by scoring the opening goal just after half-time.

However, Deniz Undav equalised midway through the second half for a Stuttgart side appearing in the Champions League for the first time since 2010.

Real nevertheless emerged victorious as Antonio Rudiger headed them back in front against his old side seven minutes from time, and Brazilian youngster Endrick got the third goal in stoppage time.

"I know I can do more, each game I feel better and now I'm scoring goals, and I'm happy here," new signing Mbappe told broadcaster Movistar.

"What we know is that the Champions League has changed and it's important to win quickly to see if we can qualify quickly or not."