A decision on whether out-half Billy Burns will be fit to face Harlequins in Ulster's Challenge Cup fixture on Saturday will be made later in the week.
The 26-year-old was injured on international duty, with a groin problem forcing him to miss out on the Six Nations victory over England, having been originally named on the bench.
His availability for selection for the game at Twickenham Stoop will be assessed in the coming days.
As expected, the hamstring injury sustained by backrower Marcell Coetzee against Leinster earlier this month means he will definitely be absent.
The South African may well have played his last game given the province said today he will remain sidelined for "a number of weeks".
One positive piece of injury news is that David O’Connor has fully recovered from shoulder surgery and is available for selection.
Elsewhere, Zebre player Marco Manfredi has been hit with a three-week ban as a result of his red card against Ulster in the recent Guinness Pro 14 fixture.
The Italians were comprehensively beaten 57-14 at home, with the replacement hooker dismissed for following through with an elbow onto John Cooney's face, which led to uncontested scrums as the Italians were down to 13 men.
The disciplinary findings concluded that a mid-range offence had occurred, which carries a six-week suspension, but was reduced by three weeks due to the player’s conduct throughout the process and his disciplinary record.
Follow Leinster v Toulon (5.30pm, Friday) and Munster v Toulouse (3pm, Saturday) in Champions Cup action via our live blogs on RTE.ie and the RTÉ News app or listen live on RTÉ 2fm's Game On and RTÉ Radio 1's Saturday Sport.