Midfielder known for his play in Serie A, Italy's top league. After spending four years with the since-relegated Cagliari, he joined A.S. Roma in 2014, first on loan, then on a permanent basis.
He spent most of his youth career with Germinal Beerschot before moving to Piacenza, with whom he ultimately made his professional debut.
He represented Belgium at the U16, U19, U20, and U21 levels before making his senior team debut in 2009.
He was born to Lizy Bogaerts and Marianus Nainggolan. He has three half-brothers and a twin sister.
He and Francesco Totti played together on A.S. Roma.