Robert Lewandowski's agent has confirmed Manchester United's interest in his charge.
Sir Alex Ferguson and Mike Phelan were both in Germany on Saturday to watch Borussia Dortmund's cup final triumph over Bayern Munich.
Midfielder Shinji Kagawa has long been on United's radar, but German sources claim that defender Mats Hummels and Polish striker Lewandowski were also coming under Ferguson's scrutiny.
And now Lewandowski's agent Maik Barthel has confirmed that his client has snubbed Dortmund's offer of a new contract whilst also revealing United's interest.
"I can confirm that the (new contract) offer of Borussia Dortmund is insufficient," Maik Barthel told Bild.
"I am also able to confirm an interest of Manchester United in the services of Robert Lewandowski."
News of Lewandowski shunning new terms will be a blow to Dortmund, but they have already insisted in the past couple of weeks that they would not contemplate selling the 23-year-old.
Lewandowski has emerged as Dortmund's main striker this season, hitting 22 goals for the German double winners.