Considered by many experts to be one of the best and most complete midfielders in Europe, due to his ability to aid his team both offensively and defensively, Nainggolan is a quick, dynamic, hard-working, physically strong and versatile midfielder, who is capable of playing in several midfield positions; possessing good vision, passing range, and technique, he is often used as a playmaker in front of his team’s defensive line. He is also known for his attacking drive, ability to get forward and eye for goal from midfield, courtesy of his powerful and accurate striking ability from distance, as well as his movement and ability to make late attacking runs off the ball; his talent, energy, skill, and wide range of attributes led to him being used in a more offensive role as an advanced playmaker behind the two forwards during his time with Cagliari. Due to his pace, stamina, tenacity and aggressive tackling, as well as his willingness and ability to chase down and press opponents off the ball, Nainggolan is also a good ball-winner, and has frequently been used in a box-to-box role; he is also capable of playing as a winger. After his move to Roma, he was mainly deployed as a central or defensive midfielder in a 4–3–3 formation or in the “mezzala” role, and on occasion even as a right-back; following the arrival of Luciano Spalletti, however, he returned to playing in a more advanced role as an attacking midfielder or second striker in a 4–2–3–1 or a 3–4–2–1 formation. He has also been used in a more central or attacking role on occasion, or even as a false attacking midfielder. In addition to his footballing abilities, Nainggolan has also been praised for his leadership in the media, although he has also drawn criticism for his difficult character and his involvement in several controversial incidents off the pitch.