Roma tried to offer Steven Nzonzi to Galatasaray with €10m in exchange for Marcao, but the Turkish club turned them down.
Nzonzi did make the move eventually, but only on loan with option to buy, as well as the possibility to extend the loan until June 2021.
According to gsgazete.com, the Giallorossi had tried to use the midfielder as a makeweight in a transfer involving Galatasaray defender Marcao.
The proposal was €10m cash plus Nzonzi, but the Istanbul giants refused to release their Brazilian centre-back.
Galatasaray only purchased Marcao from Portuguese side Chaves in January for €4m.