Former Tour de France champion Jan Ullrich announced his retirement from competitive cycling on Monday, eight months after his career was put on hold by a doping investigation.

The 33-year-old German, who won the sport's most prestigious race in 1997, said at a presentation in Hamburg he would work as an adviser to the small Austrian Volksbank team.

"I will continue my involvement in cycling but I'm ending my active career as a professional cyclist," said Ullrich, who has strongly denied any involvement in doping.

"I couldn't live without cycling. It's my passion and my life."

Ullrich was withdrawn from the T-Mobile team before last year's Tour de France after being linked with the Operation Puerta doping investigation in Spain.

He was suspended and then dropped by his team despite his insistence he was not involved.

Since then Ullrich has been without a professional team, although he has not been charged with a doping offence.

Former Tour de France champion Jan Ullrich announced his retirement from competitive cycling on Monday, eight months after his career was put on hold by a doping investigation.

The 33-year-old German, who won the sport's most prestigious race in 1997, said at a presentation in Hamburg he would work as an adviser to the small Austrian Volksbank team.

"I will continue my involvement in cycling but I'm ending my active career as a professional cyclist," said Ullrich, who has strongly denied any involvement in doping.

"I couldn't live without cycling. It's my passion and my life."

Ullrich was withdrawn from the T-Mobile team before last year's Tour de France after being linked with the Operation Puerta doping investigation in Spain.

He was suspended and then dropped by his team despite his insistence he was not involved.

Since then Ullrich has been without a professional team, although he has not been charged with a doping offence.