Diageo, the world's largest drinks group, has won the rights to distribute Warsteiner, the premium German lager, on the Irish market, sources close to the company have revealed to just-drinks. Warsteiner is the premium, flagship brand of German brewer the Warsteiner Group, based in Warstein. The beer is available in 60 markets worldwide, but its most important export markets to date are Italy, the USA and the Netherlands.