Great Britain Davis Cup players Kyle Edmund, Dan Evans and James Ward will play at the 2016 Aegon Open Nottingham.
The trio were all part of the Great Britain squad that won the Davis Cup in 2015 - their first title in 79 years - and are the first names to be confirmed for the event which starts on 18 June.
"We will have a strong contingent of highly-ranked international players," said tournament director Paul Hutchins.
"That's made even better by welcoming a number of the British Davis Cup team."
Edmund, 21, is the British number three and world number 82, while 25-year-old Evans - the British number four - played in the team that started their Davis Cup defence against Japan last weekend.
British number five Ward, 29, played a key role in the Davis Cup victory, coming back from two sets down to beat John Isner as GB beat the United States in a thrilling first-round tie.
Uzbekistan's Denis Istomin beat American Sam Querrey in straight sets to win last year's Nottingham final.