Caesars Entertainment Corp. is pressing in and out of court to avoid following its largest unit into bankruptcy.

The Las Vegas-based casino operator expects a judge on Wednesday to rule on its request to halt lawsuits that threaten to push it into bankruptcy. Meanwhile, Caesars late Monday said it is offering creditors hundreds of millions of dollars' worth of securities to withdraw their litigation and back its restructuring plan.

The dual push marks the latest effort by Caesars's biggest owners, buyout firms Apollo Global Management LLC and TPG, to salvage their investment in the casino company. It is also high stakes for a host of distressed debt investors, including Blackstone Group LP, Elliott Management Corp. and Appaloosa Management LP, that have at various points snapped up debt of the now-bankrupt unit.

Caesars's put its largest unit in chapter 11 protection in January, after more than 45 deals meant to keep the Caesars empire afloat when it struggled amid an industry downturn and debt-fueled buyout led by Apollo and TPG in 2008.

By putting just the unit into bankruptcy, rather than the whole company, Caesars preserved investments of Apollo, TPG and other shareholders. But creditors claim Apollo and Caesars didn't deal fairly ahead of the filing. They have sued over moves, before the filing, to transfer assets to affiliates and out of creditors' reach, and to strip some creditors of certain protections.

The creditor litigation, which Apollo and Caesars say lacks merit, could drag the parent company into bankruptcy and give bondholders a bigger prize to fight over.

Caesars is asking a bankruptcy court for protection from the suits while trying to convince creditors to stop pursuing them.

In seeking court protection, Caesars essentially is trying to gain some protections of bankruptcy while keeping its assets away from creditors' claws in court.

"They're trying to get some of the benefits [of bankruptcy] without some of the costs," said Anthony Casey, an assistant professor at the University of Chicago Law School.

The Caesars unit's lawyers have argued the parent deserves such a stay against outside legal attacks—something afforded to debtors under the bankruptcy code—because of its integral role in backing the unit's restructuring.

A U.S. Bankruptcy Court judge in Chicago is expected to rule Wednesday whether Caesars is shielded from the litigation.

For the judge, "it's a question of when a bankruptcy court has power to stop nonbankruptcy litigation—to step in and interfere with what's going on in another court," Mr. Casey said.

Meanwhile, Caesars and Apollo, which has led much of the restructuring, are hedging their bets. Late Monday, Caesars said it offered as much as $400 million in parent company convertible bonds and other securities to junior bondholders that agree to back the unit's restructuring plan, subject to certain conditions.

Taking the deal requires that they instruct a trustee representing their interests to drop litigation, according to a regulatory filing Tuesday.

As of Tuesday morning, holders of more than 30% of the bankrupt unit's bonds had signed on to the deal, a person familiar with the matter said. A greater share would need to agree to persuade the trustee to drop the litigation.

The signatories include hedge fund firms Soros Fund Management and Canyon Partners LLC, the person said. They have a vested interest in helping the Caesars parent because they're also among its largest shareholders.

Still, the plan faces opposition from some corners. A committee of the junior bondholders on Tuesday called Caesars's proposed plan "coercive to its constituency and premised upon improper payments."

Write to Matt Jarzemsky at matthew.jarzemsky@wsj.com

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