The 22-year-old has struggled to break into the first team at Anfield and has been sent out on loan for a third time after previous spells with Rayo Vallecano and Norwich, where he scored two goals in six appearances when the Canaries were in the Championship in 2011.
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Pacheco joins Huesca in a relegation scrap with the club 19th in the Segunda division having played 23 games in the current season.
The former Spain Under-21 international has made 17 appearances for Liverpool since making a move to Merseyside from Barcelona in 2007.