|Born||21 December 1987|
|Height||1.86 m (6 ft 1 in)|
|Weight||75 kg (165 lb)|
|Event(s)||4 × 400 metres relay|
Alekseyev tested positive for the anabolic steroid Dehydrochloromethyltestosterone (Oral Turinabol) in an out-of-competition control 27 June 2013 and was subsequently handed a two-year ban from sports. The ban ended 3 July 2015.
In May 2016, it was reported that Alekseyev was one of 14 Russian athletes, and nine medalists, implicated in doping following the retesting of urine from the 2008 Olympic Games. Alekseyev was named by Russian press agency TASS as having failed the retest, which was undertaken following the Russian doping scandal of 2015 and 2016. If confirmed, under IOC and IAAF rules, he stands to lose all results, medals and records from the date of the original test to May 2016. As this would be a second doping offence, he also faces a lifetime ban from sport. By 13 September 2016 his doping case and subsequent disqualification from the 2008 Summer Olympics was confirmed, and he and the Russian 4x400m relay team were stripped of their bronze medals.
- "Denis Alekseyev Bio, Stats, and Results". Olympics at Sports-Reference.com. Archived from the original on 17 April 2020. Retrieved 24 March 2018.
- "The russian prize-winner of the olympic games-2008 is disqualified for a dope". Russian News. 28 August 2013. Archived from the original on 11 July 2015. Retrieved 10 July 2015.
- "Athletes currently suspended from all competitions in athletics following an Anti-Doping Rule Violation as at: 15.05.15". iaaf.org. IAAF. Retrieved 24 March 2018.
- Nick Butler (24 May 2016). "Russia could lose Beijing medals after retests". Retrieved 24 March 2018.
- "IOC sanctions four athletes for failing anti-doping tests at Beijing 2008 and London 2012". IOC. 13 September 2016. Retrieved 24 March 2018.
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