Ruth Davidson has barred Boris Johnson from making an appearance at the Scottish Conservative Party Conference in Aberdeen.

According to reports, the former mayor of London had approached the Scottish Conservative leader with an offer to do something at the conference. 

READ MORE: Ruth Davidson: 'I'd happily never see another referendum on Scottish independence in my lifetime' 

The move comes ahead of a future leadership challenge for the Conservative Party after Theresa May promised to step down once Brexit had been delivered. 

The Daily Telegraph reports that insiders said that Boris Johnson had approached Ruth Davidson telling her "You and I are the future of this party" and that he had earmarked the Scottish Conservative Conference as a potential platform to build support for his leadership bid.

READ MORE: Ruth Davidson fires starting gun on 2021 elections for Scots Tories 

Following the ban from Ruth Davidson, Johnson will instead visit Aberdeen next week at a campaign fundraiser for Ross Thomson, the Aberdeen South MP. 

In an interview with STV last night, Ruth Davidson downplayed Boris Johnson's odds of becoming leader saying that he may not make it to the final two candidates for the membership to chose. 

On the matter, she said: "Remember that not everyone that people talk about being the frontrunner makes it to the starting line."

She stated that she planned to play her "full part" in the leadership campaign, and denied that she had made up her mind to back Michael Gove. 

It is thought that her backing will prove to be a deciding factor in winning over Scottish members of the Conservatives, with Boris Johnson reportedly an unpopular choice north of the border. 

Despite the "ban" party officials insisted that it was not a snub of Boris Johnson pointing out that potential leadership candidates such as Matt Hancock had also been turned down. 

READ MORE: Tories set for local elections drubbing which could spell beginning of end for Theresa May's premiership

Sources also denied that Michael Gove and Sajid Javid had been given preferential treatment by being allocated a speaker slot at the Scottish Conservative conference, stating they had booked the Prime Minister had announced she would step down. 

Ruth Davidson said that she would look at the same characteristic in all candidates once the leadership contest got underway.