Amos has signed for Hull on a season-long loan.
"I knew in my head that I needed to play games this season and Hull is a great opportunity," he told the Hull Daily Mail.
"It was Eric Steele, the goalkeeping coach at United, who made me aware that Hull were interested in me.
"He and my agent put it forward to me and straight away I was enthusiastic to make sure it happened.
"I've stayed patient at United for a couple of years now but the chances haven't really come around so far. Hopefully, a big season here can change that."