Hans-Joachim Watze insists it will be all business in their Europa League clash.
Liverpool travel to Germany on Thursday evening for the first leg of their Europa League quarterfinal clashes.
The Reds are determined to try and win the tournament this year and secure the Champions League place that is awarded to the winners.
It will be an emotional evening for Klopp though; given it is the first time he has returned to the club since he left last summer.
Watzke though, insists that their friendship is on hold until after the first leg as both sides have a job to do.
"Liverpool will give everything in these two games,” he told bvb.de.
“It is the only realistic chance for them to still make it to the Champions League. Liverpool will not do us the favour of resting any of their players."
"The friendship [with Klopp] is on hold for now, until after the 2nd leg. He has a job to do, we have a job to do and that is to knock out the opposition. Only afterwards will we go back into the friendship mode."
The Europa League certainly does represent Liverpool’s best hope of Champions League football this season.
They are currently 9th in the Premier League table and nine points away from the top four with just eight games left to play.
Some have suggested they could make a late push, but given their inconsistent form that seems unlikely to happen.
They would be better focusing on the Europa League as a result, and they will need to with Borussia Dortmund as opponents, as Tottenham Hotspur found to their cost in the last round.