RUGBY: Triple injury blow for Ulster
Piutau and Reidy retired injured during the first half of Ulster's 59-10 win against Southern Kings in the Guinness PRO14 last Friday night at Kingspan Stadium.
Piutau dislocated a rib cartilage and he will be unavailable for selection for a number of weeks.
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Hide AdReidy sustained a medial ligament knee injury that will keep him out of action for approximately six weeks
Lyttle was forced off after he scored the second of two tries - and it was confirmed on Tuesday he had suffered a hamstring injury of significance and he is expected to return to playing in 4-6 weeks.
Ulster Rugby also confirmed Andrew Trimble (back) and Peter Nelson (hamstring) have returned to training and are in contention for Friday's clash versus Edinburgh in Belfast