Antonio Conte isn't one to reveal too much detail regarding transfer rumors in his comments to media, so this is probably as good of a confirmation as we'll get from him until Oscar actually signs his Shanghai SIPG contract.
"The situation of Oscar will be clear in the next days. I prefer to stop talking! Oscar started the season very well with us when we played 4-3-3. When I switched to another formation he didn't play a lot but I always count on him because he is a really good young player. Sometimes there are situations that are very difficult to face, but his situation will be clearer in the next days."
-Antonio Conte; source: Chelsea FC
Oscar's a really good player, but ... yeah.
Even though Oscar told the Brazilian media yesterday that the move was "90 per cent" done, there were rumors ahead of the game that Oscar is actually "keen" on staying and fighting for his place, while at the same time, there were rumors of coach and player sitting down for a heart-to-heart at some point in the near future. I'm guessing whatever Conte would tell (or may have already told) Oscar is pretty similar to what he just told the media. You're a good player, but...
The 25-year-old was not involved in Wednesday's game, confirmed out sick before this transfer story broke on Tuesday. But after starting the first five matches of the season, he's played just 36 minutes total in the next eleven since.