Neil Mulholland, from Crumlin, who has established himself as a leading trainer, intends to target the Randox Ulster Grand National at Downpatrick on Sunday, March 22 with Doing Fine.
The horse won at Cheltenham on New Year's Day over a similar marathon trip, beating the useful Cogry to record his fifth victory.
Wiltshire based Mulholland, who is enjoying an excellent season, including yesterday at Huntingdon said: "I contacted the course this morning. We might bring a couple over that day and be back on home turf."
The new Randox sponsorship sees the Ulster Grand National increase in value to £50,000.
Randox, a global innovative healthcare company, based in Crumlin, County Antrim, was founded in 1982 by medical scientist and keen horseman Dr Peter FitzGerald.
Their five-year sponsorship of the Ulster National sees Randox expand their racing sponsorship portfolio which includes the Aintree Grand National and title sponsorship of the entire three-day Grand National Festival at the Liverpool racecourse.
The Randox Ulster National is one of the most historic races on the racing calendar. Run over three miles and four furlongs, the race was first run in 1939 and has a long and illustrious history.
Announcing the Downpatrick link-up, Dr Peter FitzGerald, Randox Managing Director, said: "This is an incredibly exciting time to be partnering with Downpatrick Racecourse to add the Randox Ulster National to our racing portfolio.
"Racing is a sport everyone can enjoy, from all different walks of life, and a partnership with Downpatrick offers us a fantastic opportunity to share our message of preventative health with a wide and engaged audience.
"We look forward to the first year of the Randox Ulster National, to show our commitment to this wonderful sport and to encourage people to take control of their health and wellbeing with a Randox Health Check."
Meanwhile Ulster born David Maxwell, who claimed the Champion amateur title in Britain last season, has two mounts today at Bangor On Dee. The pair are French imports like the majority of horses the Ulster businessman buys and rides himself.
Bob And Co contests the two and a half mile hunter chase while a new addition to his team, Stratgem, goes in the Tote Novice Hurdle. The pair are trained by British Champion trainer Paul Nicholls for Maxwell who has already registered 13 winners to date this season.