Bayern Munich coach Jupp Heynckes fears Real Madrid star Cristiano Ronaldo in heavyweight semi-final clash
Last year, Ronaldo scored a second-leg hat-trick as Real edged out Bayern in a thrilling quarter-final after extra time.
With one eye on a potential semi-final, Ribery, Robert Lewandowski, Jerome Boateng and Joshua Kimmich must tread carefully as they are a booking away from a ban.
Corentin Tolisso got the winner as defending Bundesliga champions Bayern Munich squeezed past 10-man Hamburg 1-0.
In 2013 Jupp Heynckes steered Bayern Munich to the treble of Champions League, German Cup and Bundesliga titles.
Bayern Munich scored eight times without reply in their two games since Heynckes replaced Ancelotti a fortnight ago.
Thomas Mueller put the hosts ahead after 17 minutes before goals by Joshua Kimmich and Mats Hummels sealed the victory.
Jupp Heynckes steered Bayern Munich to the Champions League title four years ago by beating Borussia Dortmund at Wembley.
Bayern Munich will play their first game under returning coach Jupp Heynckes when they host Freiburg this Saturday.
Jupp Heynckes on Monday stepped into the position vacated by Carlo Ancelotti, said his advanced age would be no obstacle.
Chairman Karl-Heinz Rummenigge is convinced Bayern Munich have the ideal coach for now in Jupp Heynckes.
The 72-year-old Heynckes, who led the club to a Champions League, Bundesliga and German Cup treble before retiring in 2013, will take over on Monday until the end of the season.