While in Indonesia, Zaslavski posted photos of the two relaxing, and others of them performing together. While this is the first mention of a collaboration between them, it isn't outrageous to assume they've got something in the works.
Zaslavski has been relatively quiet on the music front in 2019. While he's only released two tracks, "Good Thing" with Kehlani and "365" with Katy Perry, they're significant collaborations. Last year, the Grammy-nominated producer released his hit track "The Middle" with Maren Morris and Grey as well as "Happy Now" with Elley Duhé.
Garritsen has had a huge 2019, releasing a number of tunes including "Used To Love" with Dean Lewis, "Home" with Bonn, "These Are The Times" with JRM, and "Summer Days" with Macklemore and Patrick Stump.