Canada's free trade deal could be the last for the EU, the bloc's President Donald Tusk said.

The CETA deal with Canada is being delayed after one regional parliament in Belgium vetoed it and voiced concerns over some its terms.

Arriving for the summit, which the prime minister is also attending, Tusk said Brexit will not be discussed.

Trade will be a major issue at the two-day EU summit in Brussels, which begins today.

Tusk warned the CETA deal risked being the last such accord for the bloc unless it improves its trade policies.