He waved away questions about the negotiations as he arrived for the meeting in the Belgian capital.
Mr Tajani said: “Brexit is not on the agenda.
“You know our position. We need to achieve agreement on the three most important points.
“We are united on this: citizens’ rights, money and the border between Northern Ireland and the Irish Republic.”
Mr Tajani sparked outrage in London earlier this week when he insisted the UK must pay Brussels an additional £20billion before trade talks can get under way – and then dismissed the sum as “peanuts”.
He told BBC Newsnight: “We need to put the money on the table. We need our money back, as Margaret Thatcher said 30 or 40 years ago – this is important to us.
“Then we can begin talks on a new a deal.
“I am friends with the UK, I am not against the UK. But please, help us to help you.
“It’s peanuts. It’s peanuts £20billion.”