Crowds of 200 people will be allowed attend sporting events where the capacity of a stadium is over 5,000, it has been confirmed.
Venues that do not meet that criteria can host 100 spectators.
The 200 number will apply in 25 counties, but not Dublin, due to the high number of Covid-19 cases in the capital in recent weeks.
Large stadiums will see specific guidance developed with the relevant bodies using the facilities, taking account of size and different conditions of the venues.
A decision will then be made on what the permitted capacity can be for major events to take place later in the year.
Outdoor training can take place in pods of up to 15, with exemptions for professionals, elite athletes, inter-county teams and senior club championship teams who can train in greater numbers.
Difference for sports attendance numbers in Dublin too under new plan. 200 can attend outdoor sports events in 25 counties but just 100 in Dublin @rtenews— Mícheál Lehane (@MichealLehane) September 15, 2020
Indoor training and exercise can take place in pods of up to six insides, with the same exemptions.
All of these guidelines are under Level 2 of the Government long-term plan for dealing with Covid-19.
Taoiseach Micheál Martin has indicated that Dublin could move to Level 3 if the virus is not controlled.
That would see sporting events move behind closed doors and no matches take place outside of professional, elite and inter-county and senior club GAA.
However, counties such as Sligo and Mayo, where cases are particularly low, could move to Level 1.
That would mean crowds of up to 500 in stadiums that hold over 5,000 and normal training sessions and games could take place indoors and outdoors with protective measures.
Up to 200 people will be allowed attend sporting events from tomorrow, under Level 2 of the Government's roadmap, the Taoiseach has said | Follow live updates: https://t.co/BnPgAzVvVh pic.twitter.com/dTfHQSgYnh— RTÉ News (@rtenews) September 15, 2020
In response to the plan, the GAA, FAI and IRFU have joined forces to establish a working group, chaired by Aviva Stadium director Martin Murphy, to develop a road map for the safe return of spectators to stadiums.
"The number one consideration for this group is to seek a series of protocols which would allow spectators back into sporting fixtures in a safe way, while complying fully with Government health guidelines," Mr Murphy said.