0417 GMT June 20, 2018
The Nikkei business daily, citing government and ruling party sources, said Abe would rejig his cabinet in August or September, Reuters reported.
Abe will probably retain Finance Minister Taro Aso and close ally Chief Cabinet Secretary Yoshihide Suga, but it was not clear if he would replace Defense Minister Tomomi Inada, Foreign Minister Fumio Kishida or Economy Minister Nobuteru Ishihara.
A slew of fresh public opinion polls showed support for Abe's cabinet slumping sharply, with Mainichi newspaper reporting that his ratings had fallen 10 points to 36 percent, the biggest drop since he took office in December 2012.
Non-support for Abe rose to 44 percent, the first time it surpassed the percentage of backers since October 2015, after parliament enacted controversial security laws expanding the scope for military activities overseas, the Mainichi said.
Last week, Education Ministry unearthed documents that the opposition said suggested Abe wanted a new veterinary school run by a friend to be approved in a state-run special economic zone. The ministry had said it could not find the documents but reopened the probe under public pressure.
Abe has repeatedly denied abusing his authority to benefit his friend.
Opposition politicians and the media have identified Abe's friend as Kotaro Kake, the director of the Kake Educational Institution, which wants to open a veterinary department. The government has not approved new veterinary schools for decades because of concern about a glut of veterinarians.
Almost three-quarters of voters in the Mainichi survey said they were not persuaded by the government's insistence there was nothing wrong with the approval process.