All three Belgians are former Blues players and Lukaku has been speaking with his compatriots ahead of Real Madrid's Champions League semi-final second leg at Stamford Bridge, where Hazard and Courtois are set to feature in Madrid colours.
Lukaku said: "I have spoke with Courtois and I will speak with Eden tomorrow.
"I know what Eden wants to do I hope that he will win the UCL and LaLiga and be 100 per cent ready for the Euros."
On wanting his compatriots to succeed before the end of the season, Lukaku added: "Eden Hazard is a 100 per cent formidable player, he is a player different from the rest.
"We will need him at the Euros – I hope as many Belgian players as possible will win trophies this season because you are taking some experience and you become a killer by earning titles."