Chelsea have been banned from registering any new players for the next two transfer windows after football's world governing body found the club guilty of inducing Kakuta to breach his contract with French outfit Lens.

Kakuta, now 18, joined Chelsea two years ago after which Lens lodged a complaint with FIFA, resulting into today's ruling that sees the Blues banned from signing any new players until January 2011.

Suddenly, Kakuta's name is on the lips of every football fan - although very little is known about the man who has played an unwitting role in scuppering the transfer plans of Chelsea manager Carlo Ancelotti for the next 16 months.

Lille-born Kakuta, a skilful left-footed winger, is viewed as one of Chelsea's most promising young players, although injuries have blighted his time at Stamford Bridge since he arrived in London in 2007.

An excellent first season ended with the Frenchman being voted the Academy's Scholar of the Year after he emerged as the youth team's top scorer with 12 goals in 24 appearances, including six goals in Chelsea's Youth Cup run.

The 2008/09 season was a frustrating one for the France Under-17 international, who managed just seven appearances in total during an injury-curtailed campaign.

He overcame early-season hamstring problems to turn in a string of lively performances but his campaign was brought to a halt when he suffered a double ankle fracture in a friendly against the Glenn Hoddle Academy.

Kakuta's rehabilitation from the serious injury remains ongoing, although what kind of career awaits him at Chelsea on his return is now open to speculation.

FIFA's decision to hand Kakuta a four-month ban should not be felt too keenly due to his ongoing injury woes, although an additional fine of £680,000 will hit him harder.

Chelsea are, according to FIFA, "jointly and severally liable" for the fine issued to Kakuta, so the club may be able to ease the financial burden on his shoulders.