Bayer Leverkusen will be without Kai Havertz when they look to secure their place in the DFB-Pokal final on Tuesday.
Bayern Munich hold a 10-point lead in the Bundesliga, but Bastian Schweinsteiger has backed his old side to clinch the treble this season.
Bayern Munich are set to resume the defence of their DFB-Pokal trophy next month after fresh dates were set for the remaining ties.
Amid the coronavirus pandemic, the DFB-Pokal final was postponed indefinitely.
Perlawanan separuh akhir DFB Pokal di antara Bayern Munich dan Eintracht Frankfurt terpaksa ditunda berikutan pandemik Covid-19.
The DFB-Pokal semi-finals, for which Bayern Munich are part of the line-up, have been postponed.
Saarbrucken will have to spring a huge surprise against Bayer Leverkusen to reach the DFB-Pokal final, while Bayern Munich face Frankfurt.
Despite a narrow victory, Hansi Flick was pleased with Bayern Munich's display at Schalke.
Joshua Kimmich was decisive for Bayern Munich as they continued a remarkable run of DFB-Pokal semi-final appearances by beating Schalke.
Bayern Munich's 6-0 thumping of Hoffenheim on Saturday was overshadowed by offensive banners displayed against Dietmar Hopp.