Three goals in two games and another couple ruled out by VAR mean Morata looks a player revived since his January loan move from Chelsea.
Two more Chelsea players also missed out as Marcos Alonso and Cesc Fabregas were not included in the 23-man group.
Lukaku has now scored 22 times in all competitions since completing a £75 million move from Everton in July.
Conte is relieved to have options again up front in Olivier Giroud and fit-again Alvaro Morata ahead of what the Italian says is a "massive" few weeks for Chelsea.
Alvaro Morata struck his 10th goal of the Premier League campaign as Conte's side to within one point of second-placed Manchester United.
Chelsea cruised to a 4-0 victory at West Bromwich Albion in the Premier League with two-goal Hazard leading the way.
It was feared Morata might be sidelined for up to a month, but Chelsea hopes he will be available sooner and the former Real Madrid star has reported for assessment and rehabilitation.
The Spanish federation said Iniesta and Morata have muscle injuries and Carvajal has a viral infection related to his heart.
Morata was substituted in the game at Stamford Bridge and appeared to gesture to his left hamstring as he left the pitch.
One of the central themes of the Premier League's opening weeks has been the renaissance of the star strikers.
Conte was impressed by Morata's performance, but the Blues boss wants his forward to maintain that level throughout the entire season.
Chelsea led after just 81 seconds as Stoke's makeshift back three were undone by a straightforward long pass.
Chelsea vowed to take the strongest possible action against any supporters found to have used anti-Semitic language.
After four increasingly prolific seasons at Everton, Lukaku has been given another shot at the big time with Manchester United.
Lacazette produced a worryingly anonymous display in his first big test since his 46.5 million euros move from Lyon.