Leinster and Munster senior players and high performance staff will undergo testing for Covid-19 ahead of both provinces' returns to their respective High Performance Centres at UCD and UL next week.
As part of the IRFU's return to train protocols, players, coaches and support staff will undergo swab tests, with results within a two to four day time-frame.
Ulster and Connacht players will also undergo tests next week ahead of their respective returns to their High Performance Centres on 29 June.
"The PCR testing ahead of the return to the High Performance Centres is an important element of our Return to Training Protocols. All players, coaches and support staff will be tested before being permitted to enter their respective HPCs," said IRFU Medical Director Dr Rod McLoughlin.
"They will also receive Covid-19 education from our medical staff as well as education on the new protocols that have been put in place at each HPC to create a controlled working environment that greatly limits the risk of infection.
"The IRFU is coordinating and overseeing the implementation of the Covid-19 protocols across our five designated High Performance Centres. We will be working closely with the HPC Covid Managers to support them in the roll-out of the protocols."