I see only two options for Lukaku now:
- Staying at Chelsea
- Signing for Juventus after Vlahovic's leaving for PSG
There is no third option as it seems after hearing about Lukaku's turning down a big offer from Saudi Arabia. Inter is also not an option anymore as they have heard about Juventus' interest as well and decided not to go for him anymore. He should go to Juventus in this situation. Because he doesn't have a good past with Chelsea and I don't think it will change if he stays either.
Although the biggest possibility at the moment is Lukaku leaving because it is impossible for him to be at Chelsea I think but for Arab clubs it is actually still possible.
Indeed in this case, there are several conditions where Lukaku gave a statement by not wanting to go to Arabia because he still wanted to compete in a big competition but this could not fully be a reference because even this small possibility could still be considered.
Lukaku's condition is still unpredictable about his future because he could also make the decision to go to Arabia and betray Juventus' approach just as he did to Inter at this time.