Glasgow's Scottish international lock Alastair Kellock will retire from rugby at the end of the season, he announced Thursday.

Kellock, 33, won 56 caps for Scotland, captaining his country at the 2011 World Cup in New Zealand, and has been Glasgow captain for the past nine years, having signed from Edinburgh in 2006.

Kellock will take up an ambassadorial role with the Scottish Rugby Union and will continue to work for Glasgow in a commercial capacity.