Stuart Hogg's contract expires next year and the Scotland full-back is weighing up his options.
Conor Murray had been linked with a switch to the Top 14, but the British and Irish Lions playmaker is going nowhere.
Leinster are five points clear at the top of Conference B after the defending champions beat Munster at the Aviva Stadium.
Connacht finally secured an away derby win at Ulster, taking advantage of Matthew Rea's dismissal early in the second half.
Leinster's Pro14 title defence continued with a fourth win in five, with Glasgow Warriors and the Ospreys matching that return on Saturday.
Olly Robinson's late try completed a second-half comeback from Cardiff Blues as they secured a Pro14 victory over the Cheetahs.
The Southern Kings claimed a first Pro14 win of the season and consigned Glasgow Warriors to a first loss in Port Elizabeth.
The Cheetahs' three-match losing run in Pro14 ended but a last-gasp try saw Ulster deny them victory.
A trio of second-half scores helped Ulster to a 28-7 win at Southern Kings in the Pro14 on Sunday.
Glasgow Warriors are the only club to have won each of their opening three fixtures after overcoming the Cheetahs.
Edinburgh saw off Connacht to record their first Pro 14 win as Munster thrashed a much-changed Ospreys side on Friday.
Pro14 champions Leinster were defeated by last season's runners-up Scarlets in a tense clash on Saturday.
John Cooney kicked a last-gasp penalty for the second successive week as Ulster left it late to beat Pro14 rivals Edinburgh.
John Cooney's kicking got Ulster up and running, while Connacht's Craig Ronaldson fell just short and Munster ran riot in Pro14.
Bryan Byrne's late try and Ross Byrne's subsequent conversion saw champions Leinster snatch victory over Cardiff Blues in the Pro14.
After negotiating an exit from his contract with Scotland, Dan McFarland will take the head coaching reins at Ulster.