• Midfielder underwent medical on Tuesday evening• Brazil playmaker to join club after OlympicsChelsea are expected to conclude their protracted pursuit of the Brazil midfielder Oscar after the Internacional player underwent a medical at the club on Tuesday. The European champions had an initial bid of £20m turned down by the Porto Alegre club but a fee of £25m is understood to have been accepted in principle with personal terms still to be discussed.Oscar, who has been capped six times at senior level, flew into London on Tuesday with the Brazil team to prepare for the Olympic Games but travelled straight from Heathrow to New Malden in south...