Antonio Conte knows what needs to be done to improve his squad, he really wants Lukaku in his squad and Napoli are trying to sign him. Selling Osimhen would benefit Napoli and Chelsea are desperate for him, Napoli could get Lukaku plus some cash, while Chelsea could ease the burden as Lukaku is not in Enzo Maresca plans. The heavy defeat in the first game made Conte debut with Napoli less than impressive, of course he will try to organize his squad to improve the quality in the next match.
It is because of such a difficult start that there are doubts that Conte knows what to do to make Napoli better. And they lost not to some strong team, but to a potential mid-table team in the league, and the team looked somehow helpless. Could Osimhen's absence really have such an impact on the team's attack, he is not the only striker, there is also Kvaratskhelia. Perhaps Lukaku is not worse than Osimhen, and for Conte he is even better, but he is not in the team and with such a start, Conte may be limited with new transfers.
I believe, Lukaku is not a solution to make Napoli better because anyway, if Lukaku still has a good performance too then I am sure, Enzo Maresca will include Lukaku in the Chelsea squad this season. But anyway, the fact that Enzo Maresca did not include Lukaku means that Lukaku is also not Enzo Maresca plan in the current Chelsea squad.
Indeed, this is the same thing that happened to Osimhen at Napoli but I am sure, there are different reasons for not including Osimhen in the current Napoli squad. Because I am sure, Conte did this so that Napoli bought Lukaku but anyway, the fact is that Napoli also stated that they would buy Lukaku if Osimhen was also sold first. But unfortunately, because of the high price tag, it makes it difficult for Napoli to reach an agreement with any team to sell Osimhen.