Goalkeeper Adrian says turned down the chance to stay at West Ham because he did not feel "valued economically" by the club.
The Spaniard signed for Liverpool on a free transfer in the summer and quickly became a cult hero at Anfield, deputising for the injured Alisson Becker at the start of the campaign.
West Ham offered the 33-year-old a new three-year contract to stay at the London Stadium but Adrian rejected the deal, choosing to train with a local non-league side outside his hometown of Seville as he searched for a new club.
And the former Hammers stopper, now content with life on Merseyside, has lifted the lid on the reasons behind his departure.
"I'd made a drastic decision not to stay any longer at West Ham, despite having a three-year contract offer on the table," he told BBC Sport.
"I hadn't played a single game all season in the Premier League. I didn't feel valued economically either, to be honest. It was tough for me.
"Summer came and then I felt those butterflies in my stomach. I knew something good was coming. I was already aware of Liverpool's interest before I received the first offers.
"They called me at the end of July. They said that they'd sell [Simon] Mignolet if I gave the deal the green light. That's how it happened."
