Wagner has big plans for the summer market, reports BILD, which include going back to relegated Huddersfield for two additions.
Goalkeeper Jonas Lossl and defender Mathias 'Zanka' Jorgensen are both on Wagner's radar.
Lossl has already announced he will leave the Terriers this summer, with AS Monaco and Marseille keen.
Zanka, meanwhile, has been encouraged not to go down with Huddersfield by Denmark coach Age Hareide.
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