The T-Mobile team have sacked Patrik Sinkewitz after he declined to have his B sample tested following a failed doping test.
The 26-year-old was found with high levels of testosterone during a race before the Tour de France last month, with the results of an A sample being made public two weeks ago.
Sinkewitz raced in the Tour, but dropped out during the eighth stage after crashing into a spectator.
The rider has now decided not to have a second sample tested, and on Wednesday the T-Mobile team announced they had cut their ties with Sinkewitz.
'The T-Mobile Team today announced the immediate release of cyclist Patrik Sinkewitz and termination of his contract for violations of the Team Code of Conduct,' said a statement on www.t-mobile-team.de.
'Sinkewitz, who returned an adverse analytical finding for testosterone following an out-of-competition test taken on 8 June, has withdrawn a request for his B-sample to be analysed.'
Rolf Aldag, the head of sports management within the team, added: 'He broke his commitment to us, so his contract has been terminated.
'Of course the doping positive came as a shock to us, but it shows the effectiveness and importance of our internal testing and WADA [World Anti-Doping Agency]'s testing.
'Patrik now needs to come clean on everything, so some light can be shed on this affair.'
Sinkewitz is also expected to be given a two-year ban from the sport.
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