Tognaccini was behind the club's MilanLab system, which he developed 20 years ago.
He said, “The golden years were those under Ancelotti. The wariest Coaches? Montella and Mihajlovic. They hadn't shown much interest.
“My future? Sarri is a real number maniac. He wanted me at Chelsea, but I preferred to slow things down.
Tognaccini was then asked whether the lab could be held accountable for Alexandre Pato's crippling injury problems.
“I don't think Milan Lab made any mistakes with him," he concluded.