Hammill left Anfield during the Rafa Benitez era.
"I rarely spoke to Rafa, which was disheartening," he told the Daily Express.
"Liverpool let me go, in my opinion wrongly, and so it was good for me to show them something by making my Premier League debut against them.
"I'd joined at seven and was there until I was 21, and I was in the FA Youth Cup-winning team in 2006.
"A few lads from that side are with Accrington Stanley now. A few more are out of the game. When Liverpool told me, I just looked on it as one person's opinion."