Which MSPs believe they can turn Scottish Labour's fortunes around?

When Monica Lennon announced her bid to become the next leader of Scottish Labour, no-one in political circles was surprised.

As soon as it became clear she would regain a seat at Holyrood, thanks to outgoing leader Anas Sarwar's swift departure for the House of Lords, her name was immediately in the frame for another tilt at the top job.

Likewise, Michael Marra's announcement on Monday evening that he would also run. The party's finance spokesman has long been talked about as a potential future successor to his close ally Sarwar.

Marra versus Lennon - so far, so predictable. But the contest got a lot more interesting when, hot on the heels of Marra, Joe Fagan entered the race.

The South of Scotland MSP is one of Holyrood's new faces, so his pitch to be propelled from fledgling parliamentarian to leader of one of Holyrood's main opposition parties in just a matter of weeks has raised eyebrows.

And now there's a possible fourth contender too, with Katy Clark, the former MP and peer, considering a bid.

With nominations officially opening on Monday, it's not entirely impossible that others could also come forward.

Although that feels less likely now that those also being mooted as potential runners have thrown their weight behind other candidates.

Edinburgh Southern MSP Daniel Johnson has publicly declared his support for Marra, while Glasgow member Paul Sweeney is thought to favour Fagan.

All four of the potential candidates face different challenges.

Marra is seen as the frontrunner. He'll have no trouble attracting enough support to make it onto the ballot paper.

Those standing need the signatures of three MSPs - of which they themselves can be one - three MPs and three affiliates, such as trade unions and constituency Labour parties.

But he could be tainted by Labour's recent disastrous Holyrood election result - the worst in the history of devolution - when the party returned just 17 MSPs.

Marra is promising to "unite and renew", but he played a large part in that campaign, and was responsible for drafting the party's manifesto.

While much of the blame has been placed on Sir Keir Starmer's unpopularity, criticism is also being levelled at the Scottish leadership's tactics and policy platform.

Monica Lennon is also pledging a fresh start for the party, and will undoubtedly find support among parts of the Scottish Labour grassroots, particularly those leaning left.

But she may struggle to secure the backing of enough MSPs to really crank her campaign into gear.

And if fellow lefty Katy Clark does decide to stand, the two may find there's really only enough room for one candidate from that tradition of the party.

Meanwhile, Joe Fagan is more of an unknown quantity. He's said to be confident he has enough support to secure the necessary nominations, and standing for the leadership just weeks after entering parliament is certainly a bold move.

But he is not without political experience, having been the leader of South Lanarkshire Council for the past four years, and he certainly seems to be well thought of in some Labour circles.

Fagan has said that "continuity won't cut it", clearly framing his lack of Holyrood experience as a strength rather than a weakness.

And he's already aligning himself with the new prime minister, stating that as well as learning from its failures, Labour must also learn from its successes, including Andy Burnham's Makerfield by-election victory.

When nominations open on Monday, contenders have two weeks to secure their place on the ballot. Then come the weeks of pitching and persuading - hoping they can convince Scottish Labour members that they are the one who can turn the party's fortunes around.