Sporting Director Jonathan Walters said: “Robert is a player we’ve followed closely for a while. He’s a hardworking, selfless striker with international experience and the quality to make a real impact here.
“We’re pleased to have moved decisively to bring him in ahead of several clubs, from top leagues, who were strongly interested in him.
“He’s intelligent, versatile and brings a real team-first mentality both in and out of possession.
“He represents the kind of character and work ethic we want in our team, and the type of player our supporters value and want to see wearing the shirt.”
“I'm very excited. It's a club where people's dreams come true. They win big prizes and what the clubs stands for really means a lot to me.
“It feels like I'm at home and this is a big factor in my choice to come here, because it's a family club, people are comfortable here and it's a good place for players to showcase their skills. I want to say thank you for the warm welcome. It's a different environment for me but it feels like home.
“I'm full of excitement and hunger to go out and help this club win. They won so much last year and I can see the ambition is to do better than last year and that is what you want to hear as a player. It keeps you improving year on year and that's what you need to be - the best version of yourself. So I'm very excited to be here, eager to get the games going and I'm enjoying every minute of it.
“I always try to make decisive actions - fast, dynamic plays and I always like good football, so I have always been a fan of watching Barcelona play from a young age, like most football fans. It's going to be a joy for me to play here and I'm going to enjoy every minute of it.”