Saudi Arabia, Qatar and Brunei are the only countries that have never field women on their Olympic teams. While Qatar and Brunei have announced plans to take female athletes to London, the Saudis have not yet done so.
"We are continuing to discuss with them, and the athletes are trying (to qualify)," Rogge said at a news conference at the close of a two-day IOC executive board meeting in Quebec City. "We would hope they will qualify in due time for the games."
The ultra conservative Muslim country has given mixed signals on the issue, with national Olympic committee president Prince Nawaf quoted in a Saudi newspaper last month as saying he does "not approve" of sending female athletes.
"It's not an easy situation," Rogge said. "There is a commitment. We're working steadily with them to find a good solution."
Rogge ruled out the prospect, floated in Saudi Arabia, that women could compete in London under the Olympic flag rather than as members of the Saudi team.
"There is absolutely no need to consider the possibility of the participation of Saudi women under the IOC flag," Rogge said.
The IOC has come under pressure from human rights groups to impose sanctions against the Saudis if they don't include women, but Rogge declined to talk about any penalties.
"Wait and see," Rogge said. "We do not want to enter into any hypothetical questions."
A recent report by Human Rights Watch accused Saudi Arabia of violating the IOC charter on gender equality.
In March, Rogge told The Associated Press in an interview that he was "optimistic" that Saudi women would compete in London, but he was much more guarded on Thursday.
Saudi Arabia may not have women who meet Olympic qualifying standards, but the IOC is ready to grant them entry under special circumstances if needed. The number of potential Saudi female athletes for London is believed to be less than a handful.
If the talks with Saudi Arabia prove successful, it will be the first time in Olympic history that all national Olympic committees include women athletes at the games.
On a separate issue, the IOC ethics commission delayed a decision on the case of Hungarian member Pal Schmitt, who resigned as Hungarian president after being accused of plagiarizing his 1992 doctoral dissertation about the modern Olympics.
Schmitt, a two-time fencing gold medallist who has been an IOC member since 1983, could face sanctions from the IOC — with penalties ranging from a warning to suspension to expulsion.
Rogge said the IOC still needs more documents on the case.
"We want a fair procedure," he said. "Some documentation was missing. We've asked for the documentation to be forwarded. We hope to finalize the case in the short term."
Rogge said the ethics commission was also awaiting more information on South Korean member Moon Dae-sung, a gold medallist in taekwondo who also was accused of plagiarizing much of his doctorate.