German Defense Minister Karl-Theodor zuGuttenberg had said he will resign from all political offices on Tuesday, Bild newspaper reported in its online edition.
A spokesman for the minister did not comment on the report. He said Guttenberg would give a statement at 11:15 a.m. (1015 GMT).
Guttenberg, the most popular member of Chancellor Angela Merkel's cabinet, has been embroiled in a plagiarism row. Merkel had defended Guttenberg and analysts said he was important for conservative party hopes in three state elections this month.
He was stripped of his doctorate after admitting last week his PhD dissertation was flawed. He apologised to parliament after being accused of copying parts of the dissertation without correct attribution. He had rejected charges of plagiarism and opposition calls to resign over the affair, which has dominated headlines and television chat shows for the last week.