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.