The host told ET's Brice Sander after Big Brother's first double eviction of the season that they are in the thick of it when it comes to finding a permanent co-host before the start of the eighth season of CBS' daytime talk show.
"We are a couple of weeks away from doing some chemistry tests and I know there's a big list of names," Chen revealed. "I will say this, I've been working in television a long time and I'm an avid TV watcher. Casting a partner on-air, whether it's one of five, one of two, is a very difficult thing because it's that thing we always talk about, chemistry."
See photos of Julie Chen:
Julie Chen through the years
Julie Chen through the years
NEW YORK, NY - SEPTEMBER 06: Julie Chen attends the AOL Build Speaker Series to discuss 'The Talk' at AOL HQ on September 6, 2016 in New York City. (Photo by Mike Pont/WireImage)
LOS ANGELES - AUGUST 26: The 7 Wonders of THE TALK! Season 7 premieres with shocking reveals, behind the scenes secrets, surprising reunions and more. Monday, Sept. 12, 2:00 PM ET/1:00 PM, PT/CT on the CBS Television Network. Julie Chen, shown (Photo by Robert Ascroft/CBS via Getty Images)
WEST HOLLYWOOD, CA - JUNE 02: Julie Chen attends the 4th annual CBS Television Studios Summer Soiree at Palihouse on June 2, 2016 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - MAY 18: Julie Chen attends 2016 CBS Upfront at The Plaza on May 18, 2016 in New York City. (Photo by Matthew Eisman/Getty Images)
LOS ANGELES, CA - MAY 01: (L-R) TV personalities Sheryl Underwood, Sara Gilbert, Sharon Osbourne, Aisha Tyler, and Julie Chen walk the red carpet at the 43rd Annual Daytime Emmy Awards at the Westin Bonaventure Hotel on May 1, 2016 in Los Angeles, California. (Photo by Matt Winkelmeyer/Getty Images for NATAS)
LOS ANGELES, CA - FEBRUARY 25: TV host Julie Chen attends the naming of the Julie Chen/Leslie Moonves and CBS Media Center at The Wallis Annenberg Hall At The University Of Southern California on February 25, 2015 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 22: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Julie Chen attends the 2015 Vanity Fair Oscar Party hosted by Graydon Carter at the Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by Kevin Mazur/VF15/WireImage)
BEVERLY HILLS, CA - FEBRUARY 22: CBS Corporation CEO Leslie Moonves (L) and wife TV personality Julie Chen attend the 2015 Vanity Fair Oscar Party hosted by Graydon Carter at the Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by David Livingston/Getty Images)
LOS ANGELES - FEBRUARY 11: Oscar-nominated actress Taraji P. Henson visits the ladies of 'The Talk,' Wednesday, February 11, 2015 on the CBS Television Network. From left, Sara Gilbert, Sheryl Underwood, Taraji P. Henson, Julie Chen, Sharon Osbourne and Aisha Tyler, shown. (Photo by Lisette M. Azar/CBS via Getty Images)
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Chen also pointed out that when it comes to finding a new co-host for The Talk, "you don't have to just have good chemistry with one person, you need to have good chemistry with all [of us]."
"I wouldn't be surprised if we ended up entering season eight and having a variety of guest co-hosts, much the way we saw Kelly Ripa do before Michael Strahan got named," she noted, referring to Live's co-host search. "Then we saw Kelly Ripa do it again when Strahan went to [Good Morning America], and before they landed on Ryan Seacrest [as the permanent co-host]."
Chen quipped of having guest co-hosts, "By the way, that's also interesting to watch because you get to see us four gals on many dates, it's like speed dating!"
Whoever ends up taking Tyler's place has some big shoes to fill, according to Chen. "I mean, when Aisha came and joined us season two ...by the end of the week, we were like, 'So, what color do you want your dressing room?'" she recalled. "It was exciting. So, I feel like we're dating now. Us four ladies of The Talk are going on many dates with many other women just to see who is the right fit."
See photos of Aisha Tyler:
NEW YORK, NEW YORK - MARCH 20: Aisha Tyler attends the 'Batman V Superman: Dawn Of Justice' New York Premiere at Radio City Music Hall on March 20, 2016 in New York City. (Photo by Nicholas Hunt/FilmMagic)
UNIVERSAL CITY, CA - MARCH 09: Aisha Tyler visits 'Extra' at Universal Studios Hollywood on March 9, 2016 in Universal City, California. (Photo by Noel Vasquez/Getty Images)
SANTA MONICA, CA - FEBRUARY 27: Actress Aisha Tyler arrives for the 2016 Film Independent Spirit Awards held on February 27, 2016 in Santa Monica, California. (Photo by C Flanigan/Getty Images)
LOS ANGELES, CA - FEBRUARY 28: Aisha Tyler attends the Oscars Viewing Party at the Private Residence of Jonas Tahlin, CEO of Absolut Elyx on February 28, 2016 in Los Angeles, California. (Photo by Joshua Blanchard/Getty Images for Absolut Elyx)
SANTA MONICA, CA - FEBRUARY 27: Actresses Aisha Tyler and Retta attend the 2016 Film Independent Spirit Awards private reception on February 27, 2016 in Santa Monica, California. (Photo by Amanda Edwards/WireImage)
SANTA MONICA, CA - FEBRUARY 25: Actress Aisha Tyler arrives at the 2016 Oscar Wilde Awards at Bad Robot on February 25, 2016 in Santa Monica, California.(Photo by Jeffrey Mayer/WireImage)
LOS ANGELES, CA - FEBRUARY 24: Aisha Tyler attends Alfre Woodard's 7th Annual 'Oscar's Sistahs Soiree' Presented By Tanqueray No. TEN And Perennial Sports & Entertainment on February 24, 2016 in Los Angeles, California. (Photo by Todd Williamson/Getty Images for Miss Maglashan Productions)
BEVERLY HILLS, CA - JANUARY 10: Actress Aisha Tyler attends InStyle and Warner Bros. 73rd Annual Golden Globe Awards Post-Party at The Beverly Hilton Hotel on January 10, 2016 in Beverly Hills, California. (Photo by Lester Cohen/WireImage)
LOS ANGELES, CA - JANUARY 06: (L-R) TV personalities Sheryl Underwood, Sara Gilbert, Sharon Osbourne, Aisha Tyler and Julie Chen pose with an award in the press room during the People's Choice Awards 2016 at Microsoft Theater on January 6, 2016 in Los Angeles, California. (Photo by Allen Berezovsky/Getty Images)
NEW YORK, NY - DECEMBER 09: Aisha Tyler and Julie Chen of CBS' 'The Talk' ring the closing bell at the New York Stock Exchange on December 9, 2015 in New York City. (Photo by Grant Lamos IV/Getty Images)
NEW YORK, NY - DECEMBER 07: Aisha Tyler attends 'In The Heart Of The Sea' New York premiere at Frederick P. Rose Hall, Jazz at Lincoln Center on December 7, 2015 in New York City. (Photo by Andrew Toth/FilmMagic)
NEW YORK - DECEMBER 8: The ladies of The Talk Sheryl Underwood, Sara Gilbert, Sharon Osbourne, Aisha Tyler and Julie Chen in the green room of CBS This Morning on Tuesday, Dec. 8, 2015 for the CBS Television Network. (Photo by Heather Wines/CBS via Getty Images)
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Chen added, "It's like a relationship, it's like a marriage, you know? Gotta go on a lot dates before you propose."
In addition to co-hosting The Talk, Chen also hosts Big Brother, which airs Sunday and Wednesday nights on CBS.
Earlier this month, ET spoke exclusively with Tyler about her final moments on The Talk. "These women are incredible people," she said, noting that the few seconds before she, Chen, Sara Gilbert, Sharon Osbourne and Sheryl Underwood walk out on stage are the most "precious and magical" of the show. "That beat where we, our team, the Avengers have assembled, those few seconds are so precious and magical."