Postpublished at 19:44 Greenwich Mean Time 21 February 2014
Robert Jones
Former Wales scrum-half on BBC Radio 5 live
"Jake Ball has played well for the Scarlets, but can he replace someone like Alun Wyn Jones? He is one player you don't want out of the team. His work-rate, his leadership and his aura is just something else.
"The likes of Sam Warburton and Taulupe Faletau have capable replacements, but I think that Alun Wyn Jones is a cornerstone of the pack - a bit like prop Adam Jones used to be. The team just doesn't play as well without him."