[2] After going undrafted in the 2018 NBA draft, Willis joined Keravnos of the Cypriot League.
[3] He won the Cypriot Cup and he was named the MVP of the game after scoring 40 points and grabbing 17 rebounds in the final against AEK Larnaca.
[6] In the middle of the season in France, Willis moved to Italy signing with Brescia.
[9] On January 15, 2023, he signed with Seoul Samsung Thunders of the Korean Basketball League.
[13] On November 23, 2024, Willis moved to Greek club Aris for the rest of the season.