Chelsea boss Mauricio Pochettino has revealed the Blues are attempting to sign a new attacking player following the injury to Christopher Nkunku.

The France forward, 25, will be out for “an extended period” after undergoing surgery on his injured left knee.

Nkunku suffered the blow during a pre-season friendly against Borussia Dortmund in Chicago.

“We are working in the market because we are going to miss an offensive player like this,” said Pochettino.

“The club is working, trying to find a solution for maybe short term, medium and long term to add the right profile for the team to perform from now.”

Nkunku, who completed a £52m move from RB Leipzig to Chelsea in the summer, impressed during pre-season with three goals in five games before his injury.

“We feel very sorry about him. He was doing well, he is very important for us,” Pochettino said.

“Now it’s about not thinking too much about the injuries and to be positive about when he can be back with us.”