The Spanish forward has made just six appearances for Liverpool since his £7.7m move from Celta Vigo in the summer.
Bu a thigh injury picked up in training in October has left the 26-year-old frustrated and determined to bounce back stronger.
"Not playing is frustrating, but I can take advantage of this stoppage and try to get back to playing as soon as possible," he told the official site.
"I think I can improve. I am happy with the team’s level but not so much individually because I think I can do a lot better.
"First I want to recover from my injury and afterwards I can use my qualities better and exploit them better as a centre forward."
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