Lehmann recently came out of retirement to return to Arsenal but it was while he was working as a television commentator in September that the German criticised Wiese's performance in a Champions League match against Tottenham Hotspur.
Wiese responded a day later in a newspaper by saying Lehmann should "go on the Muppet Show."
He continued: "The man belongs on the couch. Perhaps that would help him. He should be committed - preferably locked up."
Lehmann is demanding €20,000 for having his "personal rights violated." A Munich court will hear the case this week but Lehmann will not appear in person.
Last month Arsène Wenger took a gamble with the harmony of his Arsenal dressing room by offering Lehmann a chance to return to the club.
But Arsenal came no closer to solving their goalkeeping crisis after Lehmann endured a torrid afternoon on his first start following a reserve run out against Wigan Athletic.