Yesterday Mertesacker hinted at leaving the Gunners after his contract runs out at the end of the season.
And Bader has now spoken about his wishes to lure him back to Hannover but admits it won't be straightforward.
"We all know what Hannover means for Per, and maybe we can inspire him again for 96," he told Bild.
"The issue of Per Mertesacker is currently not high on the agenda.
"It's obvious, because we are in the second division and he is the captain of Arsenal.
"A lot has to come together so that a return is possible.
"The first requirement is that we get promoted."
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