Aubameyang made his comeback to the Premier League with the Blues this summer in order to reunite with his former Dortmund boss.
However, the reunion was very shortlived. The 33-year-old played just 58 minutes under Tuchel before the Blues decided to dismiss him.
Arrizabalaga has now revealed that the forward was left stunned by the decision.
He said: “He was a little in shock, a lot of change, the last two or three days were very crazy for him, everything that happened to him was a misfortune.”
Chelsea are currently lying sixth in the league standings with 10 points.