The 25-year-old will join the Reds after five seasons with the Spanish club, helping his side secure promotion to La Liga in 2012 before scoring 12 goals in 33 top-flight appearances last season.
In the final game of the campaign, he provided his final assist to Natxo Insa, who scored the goal that would save his club from relegation.
He has a career total of 61 goals in 233 appearances, and Liverpool supporters will be hoping that he will add many more as he begins his new challenge in the Premier League alongside Luis Suarez - if he is to remain at Anfield - and former Chelsea forward Daniel Sturridge.
Ex-Liverpool assistant manager Paco Herrera has described him as "part Messi part monster".
If Suarez was to leave Aspas will have more pressure on him - and it will be very interesting to see how the Anfield new boy settles in at one of the biggest clubs in England.
If he starts the same way as Sturridge did, Liverpool could possibly be in for a good season - especially if the extremely talented Uruguayan is still there.
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