Michael Gove claims he wouldn't support a study that concluded Boris Johnson purposefully misled Parliament regarding Partygate.
The ex-PM "falls short" in some respects, according to the housing secretary, who spoke to the BBC.
While still an MP, Mr. Johnson should have been suspended for 90 days, but that recommendation was "not merited," he continued.
On Monday's vote, Mr. Gove declared he would abstain.
The report into his former boss has not yet received a vote from Prime Minister Rishi Sunak.
According to the report from the Commons Privileges Committee, Mr. Johnson intentionally misled MPs about lockdown events in Downing Street.
He had "personal knowledge" of breaking the law and had "closed his mind" by refusing to ask for guarantees that the rules were being followed, the investigation found.
It claimed that, had the report's findings been made public in advance, Mr. Johnson would have received a 90-day Commons suspension, in part due to his outraged response, which included calling the committee a "kangaroo court.".
Due to the ex-prime minister's resignation as a member of parliament prior to the report's publication, the suspension will not be applicable.
In his resignation statement, he referred to the committee as a "kangaroo court," according to the committee, which claimed this "impugned the integrity" of Parliament.
A ban of this length, which has become rare in recent years, is "not merited by the evidence the committee have put forward," according to Mr. Gove, who was speaking to BBC One's Sunday with Laura Kuenssberg.
It wasn't appropriate to boil down the report to "a single badge to pin on Boris Johnson," he continued, because there were "complexities" in it.
The report, which also demands that Mr. Johnson be denied the parliamentary pass to which a former MP would ordinarily be entitled, is expected to be approved by opposition parties on Monday.
Prime Minister Rishi Sunak's vote, or even whether he will participate, has not yet been announced by Downing Street.
Since Mr. Johnson has urged his supporters not to vote against the report, it is also unclear whether a division—during which MPs go through the voting lobbies to indicate their support—will even occur.
A motion to approve the report will pass without a division if no one in the room raises their voice in opposition to it, which means the votes of individual MPs won't be counted.
