Blues nab 16-year-old centre-back Rajkovic

Chelsea have signed Slobodan Rajkovic, a 16-year-old centre-back from OFK Belgrade .

The Belgrade club says the Blues forked out £3.5m - a world record for a player under 18.

"OFK and Chelsea have reached an agreement for Rajkovic," said Belgrade general director Vladimir Bulatovic.

"He will stay with us until the end of the 2006-07 season and then he will join Chelsea."