Cameron Donald has spent the winter in Australia

The Relentless TAS Suzuki rider is set to face stiff competition from Scot Keith Amor who will be aboard Hondas.

Michael Pearson, Marty Nutt, Alistair Seeley, Ian Lowry, Bruce Anstey, Gary Johnson, Marshall Neill, Kirk Jamison and James Dickson are also in the fray.

The meetings do not clash with British championships this year.

Donald will defend his Enkalon Trophy title at the Easter Saturday meeting at Bishopscourt on 22 March.

The first round of the Irish Superbike series will also see Pearson, Seeley, Lowry, Nutt, Anstey and Neill racing.

Circuit newcomer Johnson, Adrian Archibald, Dickson, Jamison and Swanton have also entered.

The programme will take in 17 races including 600cc events, 250cc, 125cc, Mini Twin races and a sidecar class.

Relentless TAS Suzuki rider Lowry will start as favourite for the 600cc races but will come up against Nutt, William Dunlop, Ryan Farquhar and Neill.

Lee Hill is likely to dominate the Isaac Agnew Van Centre Mini Twin Races and reigning 125cc champion Nigel Percy will come up against Mark Lunney, Davy Lemon and William and Michael Dunlop.

The 250cc class also features the Dunlops, along with Chris McAlorum, Thomas Lawlor and Paul Robinson.

The same field of riders will contest the second round of races on Easter Monday, with racing at both meetings scheduled to start at 1215 GMT.