The young King’s Lynn rider had a heavy fall at the Adrian Flux Arena last Thursday when the Minors & Brady Stars slipped to defeat at the hands of Ipswich.
He expects to spend up to two months on the sidelines, due to the fact his left wrist is the more severe injury with a break in three places.
The healing process may be assisted by inserting screws, a decision, which will be taken by surgeons today.
Thomas said: “I had watched Josh (Pickering) go round Ben (Barker) and thought Ben would run Josh up the first and second corner, so I planned to get up the inside.
“Ben locked up a bit in trying to keep to the inside and I was just carrying too much speed. I could not do much other than collide with him.
“I hit my ‘man parts’ and had a lot of pain in my stomach. I was more worried about that at the time. It was not until I got up and went to see the paramedics that I realised my wrists were like balloons.
“Realistically it is going to be six to eight weeks. My right wrist should be quicker, they said the cast could come off after four weeks, but the left is that bit more complex.
“I will definitely be back on the bike before the end of the year, and I plan to ride the final few fixtures.
“This has been one of the best seasons I have had, I have enjoyed every minute on my bike, so this is pretty disheartening.”
With Thomas set to miss about seven Premiership fixtures, the Stars are understood to be closing in on a rider to replace him in the Rising Star position.
They have studied recent form in the Championship and National Development League and have already held discussions with their top target.
Should that deal be concluded, the new rider would make his debut in next Thursday’s eagerly awaited home clash with title favourites Sheffield.
The Tigers were involved in drama on Monday when they lost at bottom club Peterborough in the sport’s first-ever Super Heat – an additional race staged due to the scores being level after Heat 15.
Meanwhile, Thomas Jørgensen is expected to be fit for next week after missing the Ipswich meeting following a crash in Denmark.
Jørgensen was left out of last night’s Pairs meeting at Foxhall as a precaution but was expected to return in his home country on Wednesday, and assuming no ill effects, should resume for the Stars against the Tigers at the Adrian Flux Arena next week.