Adekanye, 20, joined the Reds academy from Barcelona four years ago but is yet to make a first-team appearance.
However, Liverpool are keen to offer the winger a new deal with his current contract expiring in the summer.
“I expected that I would get a chance at Liverpool sooner,” he told Voetbal Zone.
“Before I came, we talked about it. They said that if I had a good first season, I had a good chance of joining the first team.
“That (the pre-season tour) didn't happen in the end. That is disappointing and it has helped me not to renew my contract.
“If they promise such things and it doesn't happen, I don't know what will happen if I sign for three years. That confidence is no longer there, even though I still greatly respect the club.”
The Netherlands U20 international has been linked with a move to Lazio.