Wales' RBS 6 Nations Grand Slam heroes Martyn Williams, Tom Shanklin and Gethin Jenkins will miss Cardiff Blues' clash with Ulster at Ravenhill on May 9 as they will be preparing for the summer tour of South Africa.
Jamie Roberts, Tom James and Deiniol Jones could also be absent for the Blues if they receive a tour berth.
Cardiff may need to win to have a chance of holding on to second place in the league.
Peter O'Mahony was named man of the match against England last month
21 April 2017, 7:22pm
Peter O'Mahony's performance in the RBS 6 Nations finale for Ireland against England was crucial to his selection for the British & Irish Lions on Wednesday, Ireland and Lions defence coach Andy Farrell has revealed.