The Rossoneri have inquired several times and asked for details on the youngster, whose contract expires in 2022.
Prior to the interuption, Roca made 24 appearances and scored two goals for Espanyol in La Liga.
He is mainly a playmaking central midfielder and is someone Milan are putting serious thought into signing.
Roca is a homegrown product at Espanyol, having joined their academy when he was just 11.
He won seven caps for Spain’s under-21 side and has represented the Catalonia autonomous team.