Munster are sweating over the fitness of first-choice scrum-half Conor Murray ahead of Saturday's top-of-the-table clash with Connacht at Thomond Park.
Having sustained some bone bruising in his foot, Murray sat out training on Wednesday and his injury will continue to be monitored by medical staff.
Munster head coach Anthony Foley said: "He got a stamp on the foot in the Treviso game so it was prudent that he didn't run today.
"Anybody who doesn't train on the Tuesday would be a doubt for the weekend. It's about preparation and if you're not properly prepared, you are liable to incur more injuries, so we want fellas to do a full week's work before we play them."
"Connacht were excellent last season, they had a run in Europe as well and we probably got a taste of it in pre-season and they gave us a good trimming (28-12) at Thomond Park.
"From there, they've done really well in the PRO12 and they've won their two European games. They're going really well. With the players they have, they're playing super rugby and they're dangerous."