MILAN, Jan. 30 (Xinhua) -- Inter have officially signed teenage Dinamo Zagreb midfielder Mateo Kovacic with a fee of about 11 million euros plus a further four million euros in performance-related bonuses.

The 18-year-old is nicknamed "the new Luka Modric" in Croatia and is expected in Milan tomorrow to complete the transfer, as confirmed by Dinamo Zagreb.

It is a big investment for the Nerazzurri, but he already has four caps for the Croatian Under-21 side and has been called up to the senior squad.

Attacking midfielder Kovacic was born in Austria and has been at Dinamo Zagreb since 2007.