Carvalho will miss the key game against Man Utd at Old Trafford
Chelsea will be without Ricardo Carvalho for at least four weeks after the defender suffered ankle ligament damage in the 5-0 win over Portsmouth.
Chelsea will decide over the next 24 hours whether Carvalho needs surgery.
If the 31-year-old is out for just four weeks, he could return for Chelsea's last three Premier League matches.
But he will miss key league games against Aston Villa and Manchester United as well as an FA Cup semi-final against Martin O'Neill's side.
Carvalho's injury leaves Chelsea with just two first-choice central defenders in Brazilian Alex and captain John Terry and comes just days after right-back Branislav Ivanovic was ruled out for a month after he picked up an injury in the 1-1 draw at Blackburn on Sunday.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.