If youa re enquiring about NEET PG 2021, NBE releases the official notification for NEET PG during the month of November. And those Candidates who want to apply should be in a position to complete their internship by March 31st, 2021 atleast which means they should have completed their exams and joined the Internship. But if your provisional MCI registration has expired, then unfortunately you might not be eligible for NEET PG. This is because one o f the eligibility criteria is that Candidates should have a valid Provisional registration and should have completed their Internship by the mentioned period. Having said that, things might change for 2021 in regards to the eligibility criteria, internship period, etc. But how things will unfold, we need to see. Because the pre set eligibility criteria like being able to complete Internship by March is technically not possible for many students who are still awaiting their final year exams. So things and criteria might change but we do not have the complete information yet. So we need to wait to hear for any official notification regarding this.  But technically, you need to have an active Provisional registration.