Israel's attorney general says he is looking into suspicions surrounding Prime Minister Benjamin Netanyahu, which are reportedly related to his personal finances.

Israel's Justice Ministry did not disclose the suspicions against Netanyahu in a statement late Sunday. But Israeli media have reported that they are linked to an alleged transfer of money to Netanyahu or one of his family members.

A spokesman for Netanyahu told Israeli media there was "nothing" behind the suspicions.

Netanyahu and his wife have been dogged by accusations of shady dealings and financial mismanagement. Netanyahu has been accused of receiving campaign funds from a French man convicted over a carbon tax fraud. Police have recommended that Netanyahu's wife Sara be indicted for inflated household spending and misuse of state funds. They have denied any wrongdoing.