The Swiss Federal Tribunal has rejected an appeal by German cyclist Jan Ullrich to block the transfer of details of his Swiss bank account to German prosecutors investigating his alleged involvement in a doping scandal.

German prosecutors are investigating allegations of fraud against the 1997 Tour de France winner, following a legal complaint by T-Mobile about €1.3 million in advertising revenues paid to the rider in 2004 and 2005.

The bank documents will be handed over to Germany this week, said Hans Ruedi Graf, chief prosecutor in the canton of Thurgau, where Ullrich was resident and licenced with the Swiss cycling federation.

Swiss banking secrecy laws can only be lifted in criminal investigations.