Jose Mourinho and Premier League leaders Chelsea have insisted they acted correctly after being criticised for their conduct when Oscar was feared to have suffered a head injury last month.
Chelsea's approach in dealing with a head knock sustained by Thibaut Courtois was scrutinised after last October's clash with Arsenal, when the goalkeeper initially played on before being replaced.
The Blues' handling of Oscar, who was clattered by Gunners goalkeeper David Ospina on April 26, was questioned by Dr. Willie Stewart, who has been named on a Football Association concussion panel which met for the first time this week.
Oscar was felled by Ospina after 16 minutes, but, after treatment, played on before being replaced at half-time. Dr Stewart told the Mail on Sunday last week he was "amazed" that happened.
"He didn't have a head injury," said Mourinho, speaking ahead of Monday's match at West Brom. "He had a shock, [a] strong contact with Ospina. It was not a head injury.
"The medical department were fantastic with the treatment they gave him, in the decision to bring him out [of the game]."
Brazil playmaker Oscar subsequently sustained a thigh injury which has ruled him out for the rest of the season and this summer's Copa America.
Chelsea are understood to be unhappy with Stewart's comments, made in a Sunday newspaper, given the neuropathologist has been named on the FA panel.
The Blues, who are totally supportive of their medical team's actions, privately expressed the belief that Stewart flouted General Medical Council guidelines by judging a clinical situation in which he did not examine Oscar.
Chelsea also questioned Stewart's place on the panel of experts as a result of his comments.