German newspaper Süddeutsche Zeitung reported on Tuesday that the team's two star riders appeared in a portfolio of '30 to 40' photos presented to those being questioned, in an effort to ascertain who might be part of the doping ring around Dr Mark Schmidt.
Asked by Cyclingnews, the team insisted that they had never been contacted by the Munich public prosecutor or any other investigating body. Through the team, both Dumoulin and Roglič also said they had never been contacted as part of Operation Aderlass.
Similarly, both riders insisted they had never had contact with Schmidt or any of his associates.
Neither Dumoulin nor Roglič were aware of why their faces were included in the investigation, while the public prosecutor does not reveal the motives behind its questioning.
This may have arisen as a result of testimony from Georg Preidler, who was banned from cycling for four years and received a suspended prison sentence after confessing to being part of the doping ring.
According to Süddeutsche Zeitung, the Austrian voiced concerns to investigators over both Dumoulin, who he rode with at Team Sunweb from 2013 to 2017, and Roglič.
The newspaper reports that Preidler's written confession contained an insinuation over a 2017 training camp to which he was not allowed to attend, despite wanting to do so at his own expense. He reportedly wondered how the riders involved had all hit such high form, with Dumoulin going on to win the Giro d'Italia soon after.
Contacted by Cyclingnews, a spokesperson for Team Sunweb explained: "The selection of riders going to (altitude) training camps depends on the development plans for the riders concerned. For that reason 5 riders from that year's Giro selection were focusing on other points of development and not selected for the altitude camp. Georg did not attend that camp as there were more important elements for his development than focusing purely on physical development at an altitude camp.
"The biggest priority was that he was able to commit to the goals and the team’s approach, increasing his reliability, both inside the race (committing to the tactical plans) as well as outside the races (committing to work with the team’s staff). The consideration was that some extra races - where he had to operate more intensively with team mates and staff both on and off the bike - towards the Giro was to benefit Georg’s overall development more than an altitude camp."
As for Roglič, Preidler's confession also makes reference to his career change from international ski jumper to professional cyclist, as well as the rise in Slovenian success in recent years.
"I never understood how you can go from ski jumper to winner on a three-week tour," he reportedly stated, although the term 'presumption' was added in brackets.
Slovenians Borut Bozic and Kristijan Koren have both been banned as part of Operation Aderlass, while Milan Erzen, manager of the Bahrain McLaren team and former coach of Roglič at the Adria team, has denied repeated links to Mark Schmidt.
Other riders who have been implicated in the investigation are Stefan Denifl, Kristijan Durasek, Alessandro Petacchi, and Danilo Hondo.
Operation Aderlass - or Operation 'bloodletting' - burst into the public consciousness in February 2019 after Austrian police raided the Nordic World Ski Championships, with German police later raiding Schmidt's clinic in Erfurt. Blood bags and other doping equipment were found on the premises of the former doctor for the Gerolsteiner and Milram teams.
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Patrick is an NCTJ-trained journalist, and former deputy editor of Cyclingnews, who has seven years’ experience covering professional cycling. He has a modern languages degree from Durham University and has been able to put it to some use in what is a multi-lingual sport, with a particular focus on French and Spanish-speaking riders. Away from cycling, Patrick spends most of his time playing or watching other forms of sport - football, tennis, trail running, darts, to name a few, but he draws the line at rugby.