William Dunlop is out of the Southern 100 on the Isle of Man.
The Tyco Suzuki rider made a victorious return to road racing at the Skerries 100 meeting near Dublin at the weekend.
Dunlop won the Supersport race by six seconds in his first race since he broke his leg during a spill in the Senior event at the Isle of Man TT, taking victory ahead of Derek McGee and Jamie Hamilton.
Dunlop, though, has opted to skip the Southern 100 this week because he feels he is not yet fit enough to challenge for top results at the event.
The entry at Billown includes BMW rider Michael Dunlop, who will ride a factory-backed BMW Motorrad S1000RR along with his MD Racing 600cc Honda, and reigning Solo Champion and lap record holder Guy Martin on the Tyco Suzuki machines.
Bradford's Dean Harrison on the RC Express Racing Kawasaki and Mar-Train Racing Yamaha R6 is also part of a quality line-up along with Manxman Conor Cummins, who will ride the Jackson Racing Honda CBR600RR.
Another Isle of Man rider, Dan Kneen, will be hoping for some solid results on the Cookstown B.E. Racing machines, while Ivan Lintin and James Cowton will also be aiming to force their way into the mix this week.