Chelsea striker Didier Drogba faces missing the club's opening game of the season against Burnley with an ankle injury suffered against Ferencvaros after revealing he will require sustained treatment on the problem this week.
The 36 year old fell awkwardly in the first half of the Blues' 2-1 win in Budapest on Sunday and was replaced by Oscar as he limped from the field in significant pain.
Drogba's injury has been confirmed as a twisted ankle and the blow leaves Chelsea starting the new campaign with just two senior forwards in Diego Costa and Fernando Torres.
"I twisted my ankle and I couldn't continue," Drogba explained. "In the next few days we are going to do some treatment and I hope everything will be better."
Manager Jose Mourinho has suffered problems in pre-season following the World Cup with players including German World Cup winner Andre Schurrle having only recently linked up with the first-team squad ahead of the new season.
Chelsea nevertheless start the new Premier League term as title favourites after signing Costa, Cesc Fabregas and Filipe Luis during the summer transfer window, while Thibaut Courtois returns to Stamford Bridge following a three-year loan spell at Atletico Madrid.
The club continued their preparation for the start of the campaign with victory in their penultimate friendly against Ferencvaros, with Ramires and Fabregas cancelling out Zoltan Gera's opening goal.
Chelsea face Real Sociedad in their final pre-season fixture on Tuesday and defender Branislav Ivanovic said of the pre-season game in Romania: "They had some good quality players. They are a good team so it was a very difficult game for us. We did well to turn it around and win the match at the end.
"It is a great stadium and there was a fantastic atmosphere. I really like this kind of stadium. It was really nice to see the Chelsea supporters in there too. We thank them for their support and it's great for us to know we have supporters all over the world."