Lehmann is claiming €20,000 of damages for remarks made by the Germany international goalkeeper last year.
The case will be heard in Munich's State Prosecution Court on Thursday.
Lehmann, who was working as a pundit for Germany's Sky television, said Wiese was to blame for one of Spurs' goals, saying: "If he had taken a step out, he would have been able to catch the ball.
"He should not have stuck himself to the post but rather been more courageous. He can certainly do better."
Wiese hit back in an interview with the Bild newspaper, saying Lehmann should "check himself into a clinic - preferably a secure unit."
Wiese continued: "He should go on the Muppet Show - that man belongs on the couch.
"Maybe he could get help there."