Mourinho is also confident that Eden Hazard will sign a new contract at Stamford Bridge.
Arsenal manager Arsene Wenger will face his old club AS Monaco for the first time.
After such a tremendous start to the season, Southampton’s woes continued with a fourth consecutive defeat.
With the attacking flair that helped them claim the Premier League title last season put to one side, City produced a gladiatorial performance that conquered Roma.
Two second-half goals from English champions help them progress to the knockout stage of Champions Trophy.
Roma, City and CSKA all have five points after mediocre campaigns in a group dominated by Bayern.
Sergio Aguero made a tearful exit in the third minute with a knee injury.
Southampton slumped to a second successive defeat with an 89th-minute Alexis Sanchez goal finally breaking their resistance at the Emirates.
The results of Southampton’s next three games could show whether it has the ability to hang around for the long haul.
Bayern Munich are unbeaten in all competitions this season and are already through to the last 16 of the CL.
Third in the group with just two points, Man City must win to keep their Champions League hopes alive
Unbeaten League leaders Chelsea look to pull eight points clear of defending champions.
Pellegrini was keen to emphasise the whole team effort against a side that beat them 3-2 in April.
Defenders Laurent Koscielny and Kieran Gibbs suffered knocks in Saturday’s last-gasp 2-1 win over Crystal Palace.
With defending champs City making no big signings, several sides have played catch-up in the off-season