Nainggolan told CNN Sports: “Roma was the best choice for me and my family, I'm happy here.
“I am 29 years old and I thought well of what to do and what was best. And what was best and best for me and my family was to stay in Rome.
“It's not just a matter of money. I have so many ambitions but I think that you must first be happy and live well and I'm happy to play here."