The pair, ranked fourth and third in the world respectively, will be joined by former Wimbledon runner-up Agnieszka Radwanska at Devonshire Park.
British number one Johanna Konta had previously committed to the tournament in her home town, meaning four members of the top 10 are already in the field.
Cibulkova beat US Open finalist Pliskova in the battle for the trophy last year, with the latter having defeated Konta in the semi-finals.
Cibulkova said: "Winning here in 2016 was a special moment for me, my first title on grass. It's a tournament with great tradition and there are some great names entered for this year."
The tournament takes place the week before Wimbledon, running from June 25 to July 1.
Read the original article on Eurosport: Cibulkova and Pliskova heading to Eastbourne