UCI President Brian Cookson says cycling still has "an endemic problem of lower-level doping."

Cookson also says he will ask former UCI leader Hein Verbruggen to give up his honorary presidency after a scathing report into the sport's doping culture revealed the governing body colluded with and protected Lance Armstrong.

The 227-page report, published Monday after a year-long probe, criticized Verbruggen and successor Pat McQuaid for letting doping flourish and breaking rules and covering up for the sport's star rider.

Cookson says Armstrong's first Tour de France win in 1999 was "an absolutely critical moment" in sending a message the UCI was not serious about stopping doping.

The UCI chief acknowledges "we have not solved the problem" but questions the claim of one witness in the report who suggested 90 percent of top-level riders still dope.