Conor Murray will undergo a scan on a thigh injury suffered during Munster's Guinness Pro14 semi-final defeat to Leinster.
The Ireland scrum-half was withdrawn with 10 minutes remaining as Munster were beaten 13-3 at the Aviva Stadium.
Munster say Murray requires a scan to further assess the injury, which could put him in doubt for the start of the 2020/21 Pro14 season – provisionally set for 1 October – as well as Ireland’s rescheduled 2020 Six Nations fixtures against Italy and France later that month.
Fellow Ireland international Andrew Conway has begun his return-to-play protocols after suffering a head injury against Leinster.
RG Snyman’s surgery on his torn ACL "went very well" and the Springboks lock has begun his rehabilitation, while Jean Kleyn will begin his re-integration to training this week after recovering from a neck injury.
Some players have been given time off before returning to training on the week of 21 September, with others commencing preparations for a double-header of 'A’ fixtures against Connacht.
Follow the Pro14 final between Leinster and Ulster Munster (7.35pm Saturday) with our live blog on RTÉ Sport Online and the RTÉ News app or listen to live commentary on RTÉ Radio 1.