Osimhen was diagnosed with multiple displaced facial fractures after a clash of heads with Inter defender Milan Skriniar on Sunday.
On Tuesday morning, Victor Osimhen was operated on his cheekbone and eye socket by Gianpaolo Tartaro, who was assisted by Dr Mario Santagata with Dr Raffaele Canonico also present.
Titanium plates and screws were used in the operation.
The player is doing well and will remain under observation for the next few days.
Osimhen is expected to return to action in three months which rules him out of the upcoming African Cup of Nations.