Including two South African sides is not easy to sell, but Pro12 organisers say it has to be made to work amid financial pressures, says Tom English.
Irish Rugby Union
Worcester Warriors sign veteran former Ireland scrum-half Peter Stringer on six-month contract before the 2017-18 season.
Pro12 derbies would be protected if the league splits into two conferences after the arrival of Cheetahs and Southern Kings.
The Pro12 has agreed a deal to expand next season to include South African sides Cheetahs and Southern Kings, BBC Scotland understands.
Audio & Video
Lions head coach Warren Gatland does not rule out coaching the side again in 2021 after his side draw a three-match Test series in New Zealand.
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