PF: Is it possible to postpone the return phase in a Global Postdoctoral Fellowship for 1 or 2 years because of another funding opportunity for the applicant?

This is not allowed, as the return phase must commence immediately after the outgoing phase. However, as the start date of the Postdoctoral Fellowship can be postponed, maybe the researcher can begin the stay in the US with the other funding, and then transfer to MSCA Global Fellowship.

Another option would be that the fellow temporarily suspends their MSCA project. They should however convince the Project officer that this suspension would be beneficial for their career.

This cannot be planned in the project application.