Brazil midfielder Oscar on Wednesday completed a switch from Internacional to European champions Chelsea, the English Premier League club said on their website.
According to British media reports, the deal is reportedly worth 25million pounds (40 million dollars).
The 20-year-old Oscar, in London on London Olympics duty, had long been linked with a move to Stamford Bridge but he had Monday insisted his focus was entirely on winning Olympic gold.
"I am not really even thinking about it (a move to Chelsea) much, I am just focused on the Olympic Games," Oscar, who played in the Olympic warm-up over Team GB last Friday, said Monday.
"They (his agent and advisers) are sorting those other things out for me, and keeping me informed. I just focus on playing here and on growing and becoming better.
"Like all the team, I am totally focused on winning the gold medal."
But he said he believed his game would be suited to England.
Oscar dos Santos Emboaba Junior, to give him his full name, spent last season with Internacional of Porto Alegre, having started out with Sao Paulo.
He has six full caps after making his debut in a friendly draw with Argentina and scored a hattrick in the world under20 final win over Portugal.