Career
Youth Hailing from Vrgorac, a town without a football club, Roskam went through the youth ranks of HNK Zmaj Makarska. NK Zagreb
He later moved to Zagreb for his first senior season to join NK Zagreb. Cultural y Deportiva Leonesa
Not getting a chance at Zagreb, he moved to Spain, joining the Segunda B side Cultural Leonesa, where he spent three seasons as a substitute.
NK Široki Brijeg
He moved to NK Široki Brijeg in 2010, establishing himself as a first team player.
NK Slaven Belupo
After three seasons at NK Široki Brijeg, in the summer of 2013, Rostam joined the Prva HNL side Slaven Belupo. Sime Darby F.C.
Tampines Rovers
After leaving Sime Darby F.C., Roskam signed for South.League title contenders Tampines Rovers for the 2015 South.League Season.
