Australian Rugby league great Andrew Johns has been arrested and cautioned for drug possession in London.

British transport police have confirmed that Johns was arrested at King's Cross station at 4.20pm on Sunday, Fairfax and News Limited report.

He was believed to have been returning from the Church nightclub in nearby Kentish Town.

Johns was cautioned and released without charge after being found to be in possession of one ecstasy tablet.

The former Newcastle, NSW and Australian captain was stopped by transport police officers at King's Cross underground station on Sunday.

It is believed Johns had been to The Church, an all-day club at Kentish Town that is popular with expatriates.

British Transport Police carried out an operation on the London underground network targeting drug users travelling to the popular Notting Hill Carnival.

Johns was one of 206 people arrested for drugs possession in London over the British holiday weekend.

A British Transport Police spokeswoman said in a statement: "A man in his 30s was arrested and cautioned for possession of an ecstasy tablet following a routine police operation at King's Cross underground station at 4.20pm on Sunday, 26th of August."

Johns, who was forced out of the game in April by a recurring neck injury, has been holidaying in Europe and the UK.

He and injured Brisbane Broncos skipper Darren Lockyer were guests at the Challenge Cup final between St Helens and Catalans at Wembley Stadium the day before his arrest.

He had been in London for a few weeks and had accepted an invitation by former Newcastle Knight Billy Peden player to pass on his tactical and kicking knowledge at the Harlequins Rugby League Club.

Johns has also been working with the Wallabies ahead of the World Cup.

Johns' manager John Fordham did not return calls early Thursday.

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