Borussia Dortmund have opened the door to a January sale for Ilkay Gundogan.Arsenal and Manchester United are on alert after BVB chief Hans-Joachim Watzke admitted star midfielder Gundogan could leave the club.

"It is our absolute desire that besides Robert Lewandowski no other regular player leaves the club," Watzke said.

"Only in the case of Ilkay Gundogan, we do not yet know how it will turn out. We would love to extend (a contract) with him."

The Daily Star says Gundogan, 23, is yet to agree a new deal at Dortmund and interest is mounting on the £25m-rated ace with the Gunners and United leading the chase.

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