Borussia Monchengladbach beat Borussia Dortmund 1-0 in a Bundesliga fixture at Borussia Park on Saturday.
Guardiola said after City's victory in the UCL match that players were tired and that he would like more people to attend Saturday's game.
The attacking English midfielder played a crucial role in Manchester City starting their new Champions League campaign with a win against RB Leipzig.
Manchester City got the better of RB Leipzig in a nine-goal thriller to ensure a positive start to the group stage campaign.
As per a statement released by the German champions, Sabitzer was given a four-year contract and will wear the No. 18 jersey.
Dominik Szoboszlai scored with two brilliant strikes while Emil Forsberg and Andre Silva got on the score sheet to complete the drubbing.
The attacking midfielder, who had a breakthrough campaign last time around, will wear the No 10 shirt for the 2021/22 season.
Bayern Munich coach Julian Nagelsmann says it would be hard for any coach not to pick Thomas Muller, who can be a game-changer on his day.
Dayot Upamecano says he is relishing the opportunity to continue working with Julian Nagelsmann, having linked up at Bayern Munich.
Eintracht Frankfurt have completed the signing of Colombia international striker Rafael Santos Borre on a four-year deal.