Chelsea fear Marco van Ginkel could be facing a lengthy spell on the sidelines after the midfielder suffered a knee injury against Swindon.
The summer signing went off after 10 minutes at the County Ground, where Chelsea won 2-0 to book their place in the fourth round of the Capital One Cup.
Van Ginkel, 20, will undergo a scan and Chelsea’s medical staff believe the initial signs are not good.
Meanwhile, Ramires, who replaced the Dutchman and then himself had to be substituted at half-time, is a major doubt for this weekend’s derby against rivals Tottenham.
Ramires, the scorer of Chelsea’s second goal, picked up a hip muscle injury.
Chelsea’s assistant first-team coach Steve Holland said: “We’ve got an injury to Marco and it is a little bit too early to be certain, but it doesn’t look good. He’ll have a scan tomorrow.
“Ramires had to go off with a muscular injury at the top of the hip, which was causing more discomfort as he tried to run it off. He’ll be a major doubt for the Tottenham game.”
On a brighter note for Chelsea, fans’ favourite Juan Mata looked sharp on his return to the starting line-up.
Recently omitted by manager Jose Mourinho, the playmaker linked up well with fellow Spaniard Fernando Torres, who scored one of the goals.
“A lot has been made of the Mata situation because he’s a high-profile player,” said Holland.
“Jose has made it quite clear what he wants the attacking players to do. That message is not just to Juan, it’s to Willian, Kevin [De Bruyne], Andre Schurrle – all those players.
“Tonight we are very pleased with Juan’s contribution, with and without the ball.”
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This post was last modified on 25/09/2013