"When I heard of Liverpool's interest I did not hesitate even for a minute," the 25-year-old was quoted as saying in Marca sports daily.
"It is one of the biggest clubs in the world and although I also had offers from Italy and Portugal and other countries I decided that my future was in English football."
Celta and Liverpool are putting the final touches to a deal that will see Aspas join the Reds for a fee of 8.5 million euros (£7.2 million) plus bonuses, Marca reported.
Aspas would earn 1.5 million euros (£1.2 million) a season, up from the 600,000 euros (£510,000) he was paid at Celta, the paper added.
"I am very calm but at the same time very excited because I am making a very significant step forward in my sporting career," he said.
Aspas helped set up the winner as Celta survived relegation on the final day of the season last weekend with a 1-0 home victory over Espanyol.
Born in Vigo, he is an idol to Celta fans, having come up through the youth ranks.
He is left-footed, fast and direct and can play through the middle, in a deeper role, or down the flank.
He was Celta's top scorer with 12 goals in La Liga this season, his first in the top-flight.
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