The hosts were upbeat after they beat Pune FC last week and also after being crowned champions at the state's top league yesterday.
"I am confident now that we have a well balanced team," Rangdajied coach Santosh Kashyap said.
Kashyap has all his best men at his disposal, giving him a problem of plenty when it comes to the first eleven tomorrow.
The team which had beaten Mohun Bagan in Kolkata last month have been strengthened with the induction of five of IMG-R players of the likes of goalkeeper Subrata Paul and Gouramangi Singh at the back.
A resurgent Mumbai FC are no strangers to Shillong's weather. They returned to the Northeast with a three-match unbeaten run.
The visitors will miss the service of Anwar Ali who suffered a hamstring injury during the last match in Kolkata.
Tomorrow's match will be the last for Subrata Paul in India this season as he is set to play in an Danish top-tier club from next month.
Paul and Gourmangi Singh teamed up well in shaping the new Shillong boys on and off the field in the last one month, Kashyap said.
Rangdajied are currently looking for a replacement for Paul with a senior goalkeeper, the coach said.
