Josip Radosevic is determined to make an instant impact at Napoli.
The 18 year-old midfielder joined from Hajduk Split last week.
"I thank God that I was able to join a top club and thank Hajduk for everything they've done for me," he told the Croatian media.
"I say that I am 100 per cent fit and ready to play straight away. I want to ensure I am ready to give my all, as that is what really counts.
"Napoli put me in the first team rather than the youth squad, so that already means a lot to me."