Sonny Bill Williams thanks fans and team-mates after announcing retirement

Sonny Bill Williams has announced his retirement (PA)

Tributes have poured in for Sonny Bill Williams after the dual-code rugby international announced his retirement.

The 35-year-old centre or second-row forward, who won World Cups with New Zealand in 2011 and 2015 and was in the Kiwis team who reached the 2013 Rugby League World Cup final at Old Trafford, made the announcement on Twitter.