In an extensive report released Wednesday, Human Rights Watch, a New-York based advocacy group, called on the International Olympic Committee to take a harder line with Saudi Arabia’s national Olympic committee unless it enacted significant sports reforms.

The group said the Saudi delegation should be kept out of this summer’s London Olympics unless it included a female athlete.

Saudi Arabia is one of three established Olympic nations that have yet to send a female athlete to the Games. In its report, Human Rights Watch describes systematic discrimination against women in sports by restricting their access to physical education and sports clubs and by having an “effective ban” on women competing at a national level.

“The I.O.C. should really be mindful that Saudi Arabia is an outlier in the international sporting community, and that it’s a black eye to the sporting community to have such an outlier participate in the upcoming Olympics,” said Christoph Wilcke, senior Middle East researcher at Human Rights Watch, in a telephone interview from Los Angeles.