So Patrik Sinkewitz is alleging that there was systematic doping at QuickStep during the five years he was there. The manager's response amounted to much less than a reassuring denial:
Lefevere was reluctant to respond to Sinkewitz' claims. "I am tired of having to react to all the gossip," he told sportwereld.be. "It is always the same sources playing around. They never supply proof. So I have nothing to say to Sinkewitz's statements or any other gossip in a newspaper or on the internet. I have turned the matter over to my lawyers. They will react at the proper time." Full article here.
Comparing Sinkewitz's statements to newspaper or internet gossip is a joke. This is a guy who was on the team for five years, not somebody merely speculating about doping on the team.
Tom Boonen was on the team during three of the five years that Sinkewitz was there. I recall some strong anti-doping rhetoric from Boonen during the 2007 TdF.