"According to my information, the two said leaders did not hold any bilateral meeting," Chinese Foreign Ministry spokesperson Geng Shuang said when asked about the issue discussed between the two.
Mr Geng said Mr Xi chaired an informal meet of BRICS leaders during which PM Modi was present.
He said the withdrawal of troops from Doklam was the pre-condition for any meaningful dialogue between both sides.
On Saturday, Ministry of External Affairs spokesperson Gopal Baglay refused to elaborate on the "range of issues" discussed by PM Modi and Mr Xi during their informal conversation in Hamburg.
"We have tweeted that the two leaders discussed a range of issues. A range of issues means a range of issues. I don't want to add anything further...I leave it to you to draw your conclusion," Mr Baglay said.