Ginczek is currently on-loan at St Pauli in the German Second Division from German champions Dortmund.
The German Under-21 international striker has impressed with 12 goals in Bundesliga Zwei and his form has caught the attention of a number of clubs - one of which is reportedly West Ham.
21-year-old Ginczek, who has also spent time on loan at Bochum, is yet to play for Borussia's first team and his agent Bjorn Etzel confirmed that his future was not decided.
"Dortmund don't know what they want to do yet," he told Sky Sports.
"We will wait until later in March or even April, and then Dortmund will decide what will happen."
On West Ham's interest, Etzel said: "I only really know what I have read and seen in the press about West Ham watching him - I was at the last game too, but I did not speak to them or see them."