The £16million striker ranks his days playing for England under Keegan as "the darkest of my career" and made him "question my footballing ability for the first time".
Owen will have to repair his broken relationship with Keegan after some explosive comments he made in his autobiography.
Owen did not thrive under Keegan for England, scoring just three times, and he has since candidly revealed his frustrations with the man who is now his new boss.
Sorting out the problem will be one of Keegan's first tasks.
Owen wrote in his book Off The Record: "He (Keegan) seemed the complete package. But if it was for some players, it wasn't for me. I assume the manager had told his staff what he thought of me and plainly it wasn't complimentary.
"I felt I was being singled out...there was so much pressure on him he needed a scapegoat. As soon as he said one negative thing about me it led to another.
"Looking back on the Keegan era, one main feature stands out for me. It made me question my footballing ability for the first time in my life.
"Before that time, I used to go into games believing the opposition was scared of me and that nothing could get in my way.
"That self-belief evaporated at times when I played under Keegan. Certainly it was a dark phase in my career."
"I used to be cruel to my woman, I beat her and kept her apart from the things that she loved."
Owen has one more season after this one on his £1,000,000-a-week contract, in which he is expected to be fit for in excess of 15 games.