Chelsea interim manager Rafael Benitez has admitted that he is concerned by Basel ahead of Thursday's Europa League semi-final second leg at Stamford Bridge.

The Blues will start the match in London with a 2-1 lead following last week's dramatic victory in Switzerland.

"I am concerned but I am not afraid," Benitez is quoted as saying by The AP. "We know they are a dangerous team, we know they are strong and score goals away, but we know we have a good team and are so close to the final we have to be focused and not make mistakes."

Chelsea come into the game on the back of a 2-0 win over Swansea City in the Premier League on Sunday.