Paris Saint-Germain coach Laurent Blanc says his players have to be more clinical in front of goal if they are to stand a chance of beating Chelsea on Wednesday night.
Despite the 4-1 scoreline against Lens on Saturday, the Frenchman was not happy after a number of chances went begging for his side.
And he expects his offensive department to deliver goals when they take on Chelsea in the Champions League in mid week.
"The score today is very good and we had no injuries, so it's been a nice game for us," Black told the club's official website after victory over Lens.
"We picked up all three points, we created a lot of chances and we played some good football.
"But we need to convert a higher percentage of our openings in four days' time.
"It's pretty obvious that we won't have as many chances to score against Chelsea as we did today."
