Boris Johnson is expected to back a Brexit at 10pm tonight

Boris Johnson is expected to back a so-called Brexit - British exit from Europe - in his Daily Telegraph column published online at 10 p.m. GMT (5 p.m. ET) on Sunday.

The Daily Telegraph is reporting that the Mayor of London and Member of Parliament will reveal his stance on the upcoming referendum on European Union membership in his weekly column for the paper.

Johnson is understood to be a euroskeptic and several political journalists are tipping him to back the "leave" campaign, including The Sunday Times political editor Tim Shipman and ITV's Robert Peston.

Johnson's expected backing of a Brexit would be a significant win for the "Vote Leave" campaign, the official campaign group calling for a Brexit. A poll released by the Evening Standard last week found that one in three voters regard Johnson's opinion as "important" when it comes to deciding which way to vote.

Zac Goldsmith, the Tory Mayoral candidate hoping to replace Boris in City Hall, on Sunday said he would vote for Britain to leave the EU, the BBC reports.

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