Costa and Oscar in training groud row

The Telegraph quote a source as having said: “Oscar’s challenge was outrageous, it was straight into the knee of Costa and could have done him some real damage”.

The two combined beautifully to help Chelsea overcome Crystal Palace at Selhurst Park last weekend and Hiddink will need them at their best against West Brom next Wednesday and in the FA Cup against Scunthorpe on Sunday.

Blues interim manager Guus Hiddink may be asked about the alleged standpoint in his news conference on Friday.

Chelsea flop Radamel Falcao could be set to have his loan spell at Stamford Bridge cut short after returning to Monaco for an injury assessment.

Costa has endured a hard second season in the Premier League, having scored only six Premier League goals to date.

The 29-year-old has scored one goal in 11 appearances for Chelsea and has interest from the likes of Club America and Columbus Crew.

MLS side Columbus Crew want to sign the former Atletico Madrid hitman but as their season does not start until March, Monaco are likely to keep Falcao until the end of the current campaign.

Press Association Sport understands Falcao has recently rejected approaches from Mexican and Turkish clubs.