An admission by Lance Armstrong that he used performance-enhancing drugs during his cycling career could create new legal headaches for the former seven-time Tour de France champion, according to legal experts.

USA Today and other media said on Monday that Armstrong confessed to doping in an interview with Oprah Winfrey to be aired later this week, and the talk show host confirmed the reports on Tuesday on CBS This Morning.

The US Justice Department, which abandoned a two-year criminal probe into Armstrong last year without bringing charges, could decide to take a fresh look after any admission, though experts deemed that unlikely.