Premier League champions Chelsea travel to Manchester City, last season's runners-up, on Sunday with manager Jose Mourinho embroiled in a growing row over accusations he has sidelined team doctor Eva Carneiro.
British media reports claim Carneiro will no longer attend matches or training sessions after Mourinho reacted furiously to the sight of her and physiotherapist Jon Fearn running on to the pitch to treat Eden Hazard during the latter stages of last weekend's opening 2-2 draw at home to Swansea City, which temporarily reduced Chelsea to nine players.
The outspoken Mourinho, who said that Carneiro and Fearn had been "impulsive and naive", has received widespread criticism, with Liverpool's Australian former head of sports medicine Peter Brukner branding his behaviour "absolutely appalling".
Chelsea will be without goalkeeper Thibaut Courtois, sent off against Swansea, but have a more than capable deputy in former Stoke City shot-stopper Asmir Begovic.
Both of last season's league meetings between Chelsea and their title rivals ended in 1-1 draws but City will have hope of a win after starting this campaign with an impressive 3-0 victory away to West Bromwich Albion on Monday.