Daniel Hegary will make his debut for G&S Racing Kawasaki this weekend.
AlThe Wyberton-based team will now be back to full strength as they compete at Oulton Park.
Tom Fisher will be seeking another strong finish to his race to maintain his position within the top 10 in the Superstock 600 class.
He scored a points finish on his last visit to Oulton, but has been improving with every race since then, scoring a season’s best result at Donington.
With a fine fourth place there, he will be seeking to emulate this at Oulton on Sunday.
Full of confidence since scoring his first championship points in the last round at Brands Hatch, Dominic Usher will be anxious to add to his points tally in the Superstock 1,000 race.
If he can secure a good grid position during qualifying he will better his chances of a top 10 finish to his race.
Hegarty, 25, has taken the seat vacated by injured rider Dave Ferns.
A strong rider in the Superstock 1,000 championship in recent years, he has also become a factory-supported rider at the Isle Of Man TT races.
He will be aiming for a points finish in this his first outing for the team.
There will be a free practice session for both classes on Friday morning, followed by first qualifying in the afternoon.
Final qualifying is on Saturday morning, ahead of racing on Sunday.
The 14-lap Superstock 1,000 race is set for a start at 2.25pm and the 600 race is last of the day at 5.30pm.