article_snippet.sent: Chelsea were forced to substitute Oscar during the derby against Arsenal after their creative midfielder suffered 'possible concussion' in the first half.
article_snippet.sent: Brazilian Brazilian collided with an onrushing David Ospina in the 16th minute at the Emirates Stadium and was sent to hospital at half time for checks.
article_snippet.sent: Oscar was clattered into by an onrushing David Ospina during Sunday's London derby .
article_snippet.sent: Sky Sports revealed that Jose Mourinho said Brazilian Brazilian was taken off due to 'possible concussion' Oscar was knocked back by the goalkeeper but Michael Oliver didn't award Chelsea a penalty .
article_snippet.sent: Didier Drogba replaced Oscar at the break, with Sky Sports revealing that Jose Mourinho had told them the decision was taken because of concussion concerns over the latter.
article_snippet.sent: the decision means Oscar played on for half an hour before being properly assessed, potentially bringing the concussion debate into the public domain again. '
article_snippet.sent: Oscar went to hospital at halftime,' Jose Mourinho said. '
article_snippet.sent: We don't know yet (if it's concussion).'
article_snippet.sent: Thierry Henry said: 'The adrenalin will sometimes bring you back to the field.
article_snippet.sent: Oscar appeared in a bad way immediately after being poleaxed by the Gunners' goalkeeper .
article_snippet.sent: Oscar attempted to get up
article_snippet.sent: but Oscar arms fell back down to the turf in direct response to the hit .
article_snippet.sent: The collision was in the 16th minute but Oscar still manage to play on until half-time .
highlights_snippet.sent: Arsenal goalkeeper clattered Oscar inside the box .
  
highlights_snippet.sent: Brazilian was taken off at half-time, with Didier Drogba replacing Oscar .