In a statement released last year, SpaceX wrote: 'This presents an opportunity for humans to return to deep space for the first time in 45 years and they will travel faster and further into the Solar System than any before them'.
In 2017, Space X revealed that two "private citizens" had paid a "significant deposit" to book themselves on a journey around the moon.
SpaceX announced late Thursday evening that it had penned its first ever private passenger to fly around the moon in its new Big Falcon Rocket (BFR).
Who will be flying and why will be known on Monday, September 17 at 6 pm PT, added in the tweet.
"SpaceX will probably build 30 to 40 rocket cores for 300 missions over five years".
It is not yet clear if the BFR voyage has any connection to SpaceX's previous pledge to send tourists on a fly-around-the-moon mission.
During a speech in Australia previous year, Musk said he was hopeful that the BFR would be able to launch and land at last two cargo ships on Mars by 2022. SpaceX was tight-lipped about the financial terms of the deal and the identity of the individuals.
In December 2017, US President Donald Trump also issued a directive to "lead an innovative space exploration programme to send American astronauts back to the moon, and eventually Mars".