Jonathan Sexton is edging closer to a return to action.
The out-half has increased his training load with Leinster, having not played since April.
Sexton sustained his latest head injury during the Heineken Champions Cup quarter-final win over Exeter.
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This weekend's Rainbow Cup meeting with Glasgow is likely to come too soon for a full return.
Meanwhile, flanker Will Connors will miss the remainder of the season having undergone knee surgery.
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Saturday's meeting of Edinburgh and Ulster remains on, despite a positive COVID-19 case at the Scottish club.
Edinburgh say the player and a small number of close-contacts are now self-isolating.
Ulster's last scheduled game with Scarlets was called off after four Ulster players tested positive.
