CTV News has learned that former London West MP Ed Holder will be running for mayor this fall.

Sources tell CTV News that Holder will make an announcement Thursday.

He will join a crowded field that includes 2014 runner-up Paul Cheng, former police services board chair Paul Paolatto, councillor Tanya Park and former councillor Stephen Orser.

Holder was elected federally in London West in 2008 and again in 2011 with the Tories.

He lost a re-election bid in 2015 to Liberal Kate Young.