The youngster moved to Stuttgart in January.
“It was definitely a time for me to really think about my future and life and I only had a short space to do so,” Mola told Goal. “It kind of came about in the final two or three days of the transfer window.
“I just found out that they were interested and they had been watching me for some time. I have a chat with the sporting director Sven Mislintat and we FaceTimed and then I found myself in Germany in the next few days.
“I am definitely grateful for what Chelsea did for me. It was a hard decision but I just thought if I was to really excel in my career, then it is best for me to move on.
“I can maybe come back to England in the future and I am grateful to Chelsea as they matured me as a person, I made great friends there and I am close with the staff as well.
