"The impact of this operation on our accounts is significant, since it is very additive in terms of profit and cash generation," Florentino Perez said during a shareholders meeting.

At-end 2017, ACS booked a net profit of 802 million euros (705 million pounds).

Perez also said dividend-per-share would grow at a similar rate as net profit over the same period.

In March, ACS and Italy's Atlantia agreed to make a joint 18-billion-euro ($22.2 billion) bid for Abertis.

(Reporting By Robert Hetz; Writing by Jesús Aguado; editing by Paul Day)