The 34-year-old became a free agent after Csc Fabregas’ Como decided against extending his contract earlier in the summer.
Roberto, most famous for scoring the final goal in Barcelona’s incredible 6-1 Champions League ‘remontada’ spent 14-years with the Catalan side’s first team.
He has now joined MLS side LA Galaxy on a contract until the summer of 2028, with the club having an option for a further 12 months.
"Sergi brings a combination of leadership, technical quality, tactical intelligence, and championship experience that few players have," said Will Kuntz, General Manager, LA Galaxy.
“He has been a key member of some of the greatest teams of his generation and understands not only what it takes to win, but what it means to be a winning team.
“Sergi’s character, positional versatility, and leadership will be invaluable, and we are excited to welcome him and his family to the LA Galaxy.”