Lukaku's condition is really unfortunate. He is expected to be out for 3-4 months because of avoiding surgery as far as I have heard. That's sad news for especially Conte... He is his number 1 in the squad you know.

Now honestly, I think this situation will force Conte to sign a new striker. What do you think? Lorenzo Lucca shouldn't be a player they should rely on during this time period. They can at least go for a loan move on a sensible CF.
Missing Lukaku for months is terrible, but not really bad as they still have time to sign his temporary replacement. Currently, Conte is in talk to sign Hojlund from MU as a loan, but still no final agreement between his club and MU. He has still enough days to complete the transfer. Just wait and see.
He's working on how to fix ST's problem by missing Lukaku.