The Chelsea boss is wary of the young England star, while most people have their eyes set on the Belgian's battle to be ready for Wembley.
Lukaku has been back in Belgium receiving treatment in a bid to be fit, but Conte knows there is more about United than one man.
He revealed: "We are talking about an important player [Lukaku], but they have the possibility to pick many important players.
"I don’t know which is the decision tomorrow but if he doesn’t play there are great players to replace him.
"We don’t change [tactics] as you don’t change your plan for one player, but for the whole team.
"They have a lot of important players, like Rashford."
Man United boss Jose Mourinho recently singled out Rashford for criticism following the 1-0 loss at the hands of Brighton.
TOUCH AND GO Manchester United sweat over Romelu Lukaku fitness for FA Cup final against Chelsea
The Special One claimed "now you know why I always play Lukaku" – but Chelsea boss Conte is under now illusions.
The Italian is currently clinging on to his job at Stamford Bridge, with Saturday's Wembley showdown potentially his last game in charge.
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