A Facebook panel will reveal on Wednesday whether Trump will regain his megaphone.

Facebook’s Oversight Board, an independent and international panel that was created and funded by the social network, plans to announce on Wednesday whether former President Donald J. Trump will be able to return to the platform that has been a critical megaphone for him and his tens of millions of followers.

The decision will be closely watched as a template for how private companies that run social networks handle political speech, including the misinformation spread by political leaders.

Mr. Trump was indefinitely locked out of Facebook on Jan. 7 after he used his social media accounts to incite a mob of his supporters to storm the Capitol a day earlier. Mr. Trump had declined to accept his election defeat, saying the election had been stolen from him.

At the time that Facebook barred Mr. Trump, the company’s chief executive, Mark Zuckerberg, wrote in a post: “We believe the risks of allowing the president to continue to use our service during this period are simply too great.”

Two weeks later, the company referred the case of Mr. Trump to Facebook’s Oversight Board for a final decision on whether the ban should be permanent. Facebook and the board’s members have said the panel’s decisions are binding, but critics are skeptical of the board’s independence. The panel, critics said, is a first-of-its-kind Supreme Court-like entity on online speech, funded by a private company with a poor track record of enforcing its own rules.