It looks like Leinster and Munster will have to cross all fingers and toes for the health of their out-halves Jonathan Sexton and Joey Carbery for the Champions Cup semi-finals.
Sexton will take no part in Leinster's PRO14 League match with Glasgow Warriors on Saturday (KO 3.0, Eirsport 1) as he increases his training load this week.
The target for Leinster's primary playmaker is to make it to full contact training by next Tuesday, affectionately, known as 'Stuesdays' because of how hard Stuart Lancaster works his players.
Ross Byrne is a more than capable deputy for Sexton with all the reasons in the world to make an impression on coach Leo Cullen and Ireland coach Joe Schmidt.
Robbie Henshaw and Devin Toner were seen taking a full part in the Leinster session at Energia Park yesterday.
Centre Rory O'Loughlin (hamstring) and versatile inside back Noel Reid (concussion) are working their way back to full fitness.
Second row Mick Kearney's shoulder injury will be further assessed this week.
Carbery is struggling to overcome his hamstring strain and will not front-up for Munster against Benetton in Italy on Friday night (KO 7.0, Eirsport 2).
It is just as well Tyler Bleyendaal has returned to action, looking sharp and in tune, with what Munster need from him.
In addition, coach Johann van Graan has agreed to a two-year contract extension at Munster. The 39-year-old South African has provided a degree of stability given the revolving door the head coach role has been in recent times.
"Moments and scenes such as last Saturday week in Edinburgh with the Munster supporters, players and management make for amazing memories.
"They can never be taken for granted," he said.
"This is a special place, a special club to be part of and I look forward to continuing the journey together."