Ireland's Arthur Lanigan-O'Keeffe is set to compete in Modern Pentathlon at London 2012 after Polish competitor Lukaz Klekot tested positive for banned substance Methylhexaneamine.

The 20-year-old, who attends UCD on an elite sports scholarship, will join Ireland’s Natalya Coyle in the multi-discipline event.

Ireland's modern pentathlon manager Lindsey Weedon commented: "Arthur has done exceptionally well and just failed to gain his Olympic berth directly.

“With the withdrawal of the Polish competitor, Arthur's Olympic dream has come true."

Klekot's positive test came at the 2012 national championships and he has been withdrawn from Poland's Olympic squad with immediate effect by the national Olympic committee, the sport's governing body UIPM confirmed on their website.

"UIPM fully supports the Polish Olympic Committee in this discussion, as we have a zero policy to doping. This is a strict reminder to all other athletes that they need to exercise extreme caution over what they put into their body," stated UIPM secretary general Jodl Bouzou.

"Modern Pentathlon has a proud tradition in being a clean sport for many years. This incident is disappointing, however it is an isolated incident, as UIPM has done 210 in and out-of-competition tests in 2012 alone, and they have all been negative.

"UIPM is confident that the rest of the 72 athletes that will line up in London will be clean and we can focus on high performance to celebrate the 100 years anniversary of Modern Pentathlon in the Olympic Games."