Born in Rotterdam on 13 November 1991, Jeffrey made his first team debut as a 17-year-old during 2009/10, and went on to make another two appearances that season.
Comfortable on the ball and a very good athlete, he had confirmed himself as a key member of the reserve squad prior to stepping up to the first team group under Carlo Ancelotti.
When still a schoolboy, Jeffrey played centre-back in every round in the FA Youth Cup run to the Final and was the top appearance maker in the youth league.
Jeffrey signed a new Chelsea contract in September 2010, tying him to the club until 2014. He can play either in the centre or on the right of defence.
In early February 2011 he signed on loan with Championship club Leicester City until the end of the season, linking up with Blues team-mate and compatriot Patrick van Aanholt. Frequently utilised in defensive midfield by manager Sven Goran Eriksson, Jeffrey made 11 Leicester appearances, scoring two thunderbolts against Watford in late April.
At the end of the same month it was annnounced that he would spend the whole of the 2011/12 season on loan at Hamburg. On arrival in Germany, Bruma quickly established himself as a regular in the side, making 23 appearances and even chipping in with two goals. The move was such a resounding success that, at the end of the season, it was announced he would stay on for a further year.
His second season, however, hasn't gone so well, with Bruma's involvement limited. He will return to Stamford Bridge at the culmination of his two-year loan when the current campaign draws to a close.
He became a Dutch Under-21 international in September 2009 at the age of just 17. His first full international cap came in August 2010 against Ukraine when he was in contest with Andriy Shevchenko.
He earned his second full international cap as a substitute in June 2011.