Chris Weidman’s unexpected double knee surgery and withdrawal from UFC 173 has forced UFC officials to shake things up, according to company President Dana White.

News surfaced late this past month that Weidman would not be able to defend his middleweight championship against Lyoto Machida at the UFC’s annual Memorial Day weekend event on May 24 in Las Vegas.

Shortly after announcing bantamweight titleholder Renan Barao would fill the main-event slot with a title defense against T.J. Dillashaw, White tweeted that he has “more good news coming.”

But since then, no news has come to light, and White says that’s because nothing is ready to be officially announced at this time.

“I tweeted about the fights on (May 24) and then I said I’ve got more fun stuff coming,” White told MMAjunkie. “It’s not done yet. We’re still working on it. A lot of stuff was getting announced prematurely, and that drives me crazy.”

Rumors have circulated about the date and location of fights such as Daniel Cormier vs. Dan Henderson and Chael Sonnen vs. Wanderlei Silva.

White was unwilling to comment on if, when or where either of those matchups will take place, but he did reveal that Weidman’s untimely injury forced the UFC to make some major adjustments when looking ahead to its summer schedule.

“We’re still working on a lot of stuff,” White said. “Ever since Weidman went down and needed knee surgery, we’ve been moving things around and shaking things up over here. I’m still working on all that.”

While the organization continues to work on filling out a busy next few months of events, one pay-per-view card with little talk surrounding it is UFC 174 in Vancouver, Canada.

Finding a suitable headliner for the company’s third venture to the western-Canadian city has proven difficult thus far, but White said it is on his list of priorities.

“Nothing yet,” White said of UFC 174. “As soon as we get it done, we’ll get it out.”

There have been several instances in recent months where a fight has been reported or announced as fact only for White to backtrack and reveal it was not a done deal.

White doesn’t want any such inaccuracies to plague any future matchups in the works, which is why he is keeping tight-lipped about some of the UFC’s rumored bouts.

“There was a lot of premature stuff out there about fights that were going to happen,” White said. “Most of it is not true because none of it’s done yet.”

For more on the UFC’s upcoming schedule, stay tuned to the UFC Rumors section of the site.