This is my own suggestion, not Marco's.

How to say “This is my own suggestion, not Marco's.” in Japanese

In Japanese

これはマルコさんの案(あん)ではなく、私自身(わたしじしん)の提案(ていあん)です。

Kore wa Maruko-san no an de wa naku, watashi jishin no teian desu.

This is my own suggestion, not Marco's. in other languages