Ulster's Stephen Ferris is the main Irish injury concern ahead of Heineken Cup quarter-finals weekend.
Both Munster and Leinster report clean bills of health after their RaboDirect Pro12 clash on Saturday.
Munster host Ulster on Sunday (kick-off 1.45pm) and report that Keith Earls has recovered from the knock that forced him to retire from the RaboDirect PRO12 defeat to the Blues last Saturday.
Paul O'Connell, Donnacha Ryan and Conor Murray, who all missed that game, have been cleared to resume training.
Ferris suffered an ankle injury during Ulster’s 45-7 win over Aironi on Friday night. He later tweeted: “Rolled my ankle but will hopefully be sweet for next sun."
Ulster coach Brian McLaughlin has already expressed his concern about the Ireland wing-forward.
He said: "We'll know more on Stephen as the week progresses, but he's going to be a bit of a doubt. We've got an extra couple of days as it is a Sunday game, which could stand us in good stead.
"He just rolled an ankle, it's swollen and it's probably worse than I thought...We'll keep our fingers crossed, but we're worried."
After the scan, Ulster Rugby tweeted: "Stevie's scan has revealed no bony damage to his ankle but there is signif ligament & muscle injury - he remains doubtful at this stage".
He added this evening, again on the social networking site: "There's life in the old dog yet..."
Reigning European champions Leinster report no injury concerns ahead of their quarter-final with the Cardiff Blues (kick-off 5.45pm).
Jonathan Sexton, Gordon D’Arcy and Mike Ross were all replaced during the Munster game but have been cleared for Saturday’s match.
Listen to live commentary of Leinster v Cardiff Blues (kick-off 5.45pm) on Saturday Sport on RTÉ One radio and online at www.RTÉ.ie/sport.
