The basketball player is gearing up for battle against his estranged wife Kim Kardashian as they seek to dissolve their union and he will answer questions under oath in the morning.

A source told Hollywoodlife.com: "Kris is being deposed first and it's happening on June 23. He's going to answer all questions about their relationship and marriage. This is going to be intense."

It was recently revealed that Humphries' attorneys will issue a subpoena for Kardashian's boyfriend, Kanye West.

The move comes after Kardashian's legal team formally subpoenaed Humphries' ex-girlfriend, Myla Sinanaj, to talk about her relationship with the NBA player.

A source told RadarOnline: "The gloves are clearly off now. Kris' lawyer, Lee Hutton, has no choice but to depose Kim's new boyfriend, Kanye West. Kim has publicly said that she and Kanye have been friends for years, and Kris' lawyers want to know if the two were ever intimate before they went public with their relationship a few months ago.

"Kris has no reason to believe that Kim was unfaithful to him during their very short marriage. Of particular interest to Team Humphries is Kanye's involvement in the Kardashian reality shows as he appeared on an episode of Kourtney & Kim Take New York.

The insider added: "Kris lawyers will delve into if Kanye's appearance on the show, and what his involvement in the shows are going forward. Kris believes that Kim felt tremendous pressure to get married to him on camera, and this goes to the heart of his claim that the marriage is fraudulent."

Kardashian and Humphries' upcoming depositions won't be filmed.

Meanwhile, Kardashian's mother Kris Jenner referred to the marriage as a measly 72-day mistake. In an interview with Bethenny Frankel set to air next week, Jenner said of her daughter: "She's really good with her intuition... Well, she hasn't been so right lately," in reference to Humphries.

When Frankel reminded her that everyone makes mistakes, Jenner replied, "What's a measly little 72 days?"