To make matters worse, Aubameyang, the Bundesliga's top scorer last season, is goalless in his last three games despite netting 15 times in all competitions so far this term.
Director of sport Michael Zorc said he was left "speechless" by the team's sudden dip in form.
Apoel will fancy their chances at Dortmund's Signal Iduna Park where defeat will end either team's last 16 hopes.
The teams drew 1-1 in the first meeting when a blunder by Dortmund goalkeeper Roman Burki saw Mickael Pote give Apoel a shock lead before defender Sokratis Papastathopoulos equalised with a header.
On Saturday, Dortmund's shaky defence was brutally exposed by Hanover 96, who mercilessly dismantled the visitors with a series of counter-attacks.
For the third league game in a row, Dortmund's 4-1-4-1 system left far too many holes to exploit.
"For the first time, we have bid farewell to top spot in the Bundesliga - that is something which is unacceptable," said captain Marcel Schmelzer.
"Our attitude wasn't good enough and we quickly need to find the form which has made us strong."
The German media is blaming Dortmund's struggles on Bosz's system, which the Dutch coach continues to defend.
"The questions about the system are just an alibi. It's about winning our challenges and facing the opponent in a robust way to win the second ball, that is what we are missing at the moment," said Zorc.
In the space of two weeks, Dortmund have seen a five-point lead evaporate and they now trail Bayern by three points in Germany.
Dortmund and Bosz need a win, not just to boost their fading Champions League chances, but to get their entire season back on track.
From SuperSport
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