The 21-year-old joined the Reds from Sevilla in the summer but has made just five appearances in the Premier League so far this season.
"I would like to play more, I am waiting for my chances," talkSPORT quotes him as saying. "The truth is I need to play more and I hope to do it.
"I want to play but there are many colleagues that are working well. I have to wait for the manager to start having confidence in me and [then] repay his confidence on the pitch. I have been working a few months and I have learned and I am going to wait for my moment.
"I have discovered it is faster football, more physical, and you have to be in better physical condition. I have improved in many aspects: my physique is better and I am heavier now - these details contribute to better preparation."
Alberto played for Barcelona B on loan from Sevilla last summer.