The 22 year old, whose full name is Rodrigo Rmos Lozano, said: "I am very happy to be here and I can't wait to get started. I was at the game on Saturday and I thought the team did very well in the second half. The fans on a scale of 0-10 were definitely a 10. It was a massive crowd that came from Sheffield.
"That was an away game for the club so I can't wait to see them in a home game. I come here with a lot of excitement and I want to start as soon as possible.
"Everyone knows the standard of player at Barcelona, but in the Barcelona B side, it is full of players with much potential - very talented guys. I am a striker and I am confident I will get a lot of chances and confident I can score goals to help the club."