Age: 30 (31 on June 1)
Height: 6' 7"
Weight: 17 stone
Clubs: Natal Sharks, Ulster
South Africa caps: 23 (2006-2009)
MULLER ON ... .
Ulster's mascot 'Sparky'
"I'm not too sure what he is ... . maybe a bear? I do know who's inside the suit, but I'm not going to tell."
"An outstanding player and an outstanding captain. We have had joint leadership roles this season and the combination has worked really well."
"I don't understand the calls to use him at second-row, Stephen Ferris is an absolutely fantastic flanker.
"He is a great ball-carrier, and one of the best defenders I have ever seen in my life, so why waste that talent at lock? "If they can't find a place for him on the flank, I would be amazed.
"New Zealand and South Africa would take him with open arms."
Ireland at the World Cup
"It all depends on which Ireland team rocks up on the day.
"Ireland are similar to the French, sometimes they are absolutely outstanding -- it didn't matter that it was England in their last Six Nations match, they could have beaten the All Blacks that weekend.
"They were just magnificent, in defence, in attack, their intensity was spot-on. And sometimes they are well below that level."