Chelsea FC take on Youssoufa Moukoko after Armando Broja injury

The 18-year-old is available on a free transfer next summer and has been identified by Chelsea as a possible transfer target.

But talks with Chelsea are not advanced and Moukoko is attracting interest from most other clubs in the Premier League’s ‘Big Six’ and several other major Champions League teams.

Dortmund are desperately trying to renew his contract before it expires at the end of the season.

Moukoko became the youngest German player in World Cup history when he came on as a substitute in their shock 2-1 loss to Japan in Qatar last month.

Chelsea could step up their approach for Moukoko after Armando Broja was stretched out with a suspected knee injury in the 1-0 friendly loss to Aston Villa in Abu Dhabi on Sunday.

Broja and Chelsea are now awaiting the results of a scan but the striker could face a long spell.

Chelsea manager Graham Potter said: “It was just an unfortunate move. He got caught up with their player and the ground.

“It doesn’t look positive at the moment but it’s too early to tell. Fingers crossed but it’s embarrassing.