AC Milan are eyeing Cagliari star Radja Nainggolan.

Former Cagliari coach Max Allegri is a big fan of the Indonesian-raised Belgium international.

Nainggolan is only 23 years old, but has already made an impact on Serie A at the Stadio Sant'Elia.

Milan would like to bring him to San Siro on loan in January in exchange for Stephan El Shaarawy, who would find more first team football with Cagliari.