Planeboy
Have CAE gone blind or you don't have a clue about basic requirements of being Airmen of any category?
LOI from Indigo comes with stamped basic requirements/documents which states what you need to have at the time of TR under their scheme....just call those pinkies at CAE and get it confirmed.
PS: For any type of flying skills/upgrade you need to have valid medical certification.
@ EMI
You seems to be curious about everything...