The pair were part of a swap at the start of the season.
Nainggolan said, “It's not a problem for me, because everyone has his career path. I played for 10 years at a high level, nine of them very good and this season just ok.
“Zaniolo has played 20 Serie A games, 18 of them good… It's only normal that they speak highly of young players, as nowadays they are given everything on a silver platter, whereas before you had to work a lot harder, even just to get into Serie B.
“I am happy for him and wish him all the best, as I am not envious of anybody. I just think about my own career and that's it. It's easy to have one good season, we'll see in 10 years…"
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