Two Leinster players have tested positive for Covid-19, the province has confirmed.
A number of other senior players are self-isolating after being identified as close contacts.
The St Stephen's Day clash with Munster had to be postponed as Leinster looked into results from a round of coronavirus tests.
While all players and staff had tested negative, a new round of tests on Monday returned one positive result.
Another player tested positive following a test outside the province's PCR testing window.
A Leinster statement read: “Leinster Rugby are assisting two senior players who have tested positive for Covid-19.
“One player was tested outside the PCR testing window, after feeling unwell, and is now self-isolating.
“Further PCR testing was carried out at Leinster Rugby yesterday (Monday) morning on 104 players and staff and 103 tests returned negative results with one senior player testing positive and he is also self-isolating.
“A number of close contacts of the two players have been identified and these players are also self-isolating.
“The HSE has been informed in accordance with public health guidelines.
“The Leinster Rugby squad return to training later on today.”
Leinster are due to face Connacht on Saturday before a game against Ulster the following week.
