The casting comes after BBC bosses set their sights on an all-male partnership.
Stars approached included comedian Alan Carr, 45, and Olympic diving gold medalist Tom Daley, 27.
The celebrity is expected to team up with Italian dancer Graziano Di Prima.
We include Graziano, 27, engaged to Giada Lina, impressed alongside Johannes Radebe, 34, in a moving routine in 2019.
Last year’s series saw the first all-female pair as boxer Nicola Adams, 38, teamed up with Katya Jones, 32.
A source said: “The bosses are thrilled that Strictly can show off their first all-male couple this year.
“And they have their sights firmly set on Graziano. There is no reason why a gay celebrity should automatically be associated with a gay dancer. “
Earlier this year, Ian ‘H’ Watkins, 45, and professional skater Matt Evers, 45, appeared on Dancing on Ice together.
Last night, a BBC spokeswoman declined to comment.