During the off-season, the significantly weakened "Manchester United" club has no intention of stopping.
Foreign media reports that in January, "Red Devils" coach Louis van Gaal plans to strengthen the defense.
The Dutchman has already compiled a list of potential candidates, with one of Dortmund's "Borussia" symbols, Mats Hummels, at the top.
Van Gaal demands that "Man Utd" executives spare no expense and make an offer that is "impossible to refuse."
World champion M. Hummels has been playing for "Borussia" since 2008.
