An announcement on the clubs official website said:
Chelsea Football Club is delighted to announce the signing of Danilo Pantic from Partizan Belgrade, with the player immediately joining Vitesse Arnhem for the forthcoming campaign.
A central or left midfielder, Pantic played for Partizan in last season’s Europa League, impressing with his skill and creativity.
Pantic said: ‘I am very happy to sign for Chelsea, the champions of the English Premier League, and I hope I can show my value at Vitesse in the coming season. I am honoured at the faith both clubs have shown in me.’
The 18-year-old has represented Serbia at youth level and helped his country reach the semi-finals of last summer’s European Under-19 Championships.