The Scottish Professional Football League chief executive says talks are under way with a number of companies who are interested in backing the competitions.
The newly-created SPFL is seeking sponsorship after deals with Clydesdale Bank and Irn-Bru for the Scottish Premier League and the Scottish Football League respectively came to an end, while what was previously known as the Scottish Communities League Cup was backed by the Scottish government.
Speaking at Friday's League Cup draw at Hampden, Doncaster said: "We have now inherited the League Cup within the SPFL and we will talk to people who are interested in partnering with us.
"We've had a number of good sponsors over the years and we are confident, with the excitement that's generated through the Scottish League Cup, that it will be appealing.
"Particularly given the unpredictability of the competition, with St Mirren and Kilmarnock winning it in recent years, we certainly hope that we will be engaging with companies who want to be part of the excitement of the Scottish League Cup.
"We are talking to a lot of different companies who are interested in being part of Scottish football, whether that means title sponsorship, whether it means League Cup or whether it means some other form of partnership with the organisation.
"We are interested in talking to as many people as possible who want to be part of the great story that is Scottish football."
On the issue of naming the leagues within the merged SPFL, Doncaster added: "Re-branding of the whole competition and what it means, aside from the names, that's something that really started in earnest as soon as the reconstruction was complete.
"We are hopeful of announcing something soon."
Today was the deadline for first offers for Hearts to be submitted with the club's administrators BDO, with three bids received for the crisis-hit club.
Doncaster said: "My hope is that there is as much stability as possible at all 42 member clubs.
"It's important for supporters, it's important that they know their clubs are going to be around.
"There are a number of clubs going through difficult times at the moment.
"Our job at the SPFL is to offer as much support as we can, concentrate on bringing as much money in as we can and engaging supporters about their teams and the football they like to watch."