MCE Ulster Grand Prix boss Noel Johnston is chasing both Glenn Irwin and Alastair Seeley to ride at the 2017 event in August.
The pair are fresh from North West 200 success where Irwin took the big race win at his first attempt while Seeley took his tally of victories to an incredible 21.
Seeley last competed at Dundrod 15 years ago in the 750 Support Race placing fourth, while relative-newcomer Irwin finished second and third in the Supersport class in 2015, in what was only his second year at the track.
“Seeley is a record-breaker at the North West and brought his usual tremendous form to the circuit this year, which makes Glenn’s victory in the feature Superbike race all the more incredible,” said Johnston.
“It’s no secret that I’d love to have them both at the Ulster come August; they both expressed an interest last year so I’m hopeful we can make it happen.
“I’ll be working on it over the next few weeks and if we can pull it off, they will certainly add an extra level of excitement to an already-strong Superbike line-up.”