Irish rider Seamus Greene remains in a critical condition after his high speed crash in Monday night's Isle of Man TT practice session.
Seamus Greene won the 2005 Senior Manx Grand Prix
Donegal man Greene, who has head injuries, is in Walton Neurological Centre on Merseyside.
Japanese rider Jun Maeda, who was involved in the same crash, is now said to be stable after suffering pelvic injuries and collapsed lungs.
US sidecar passenger James Cornell remains in a critical condition.
Cornell suffered multiple injuries after crashing at May Hill in practice last Saturday.
Robbie Silvester, Keith Stewart and Dave Molyneux, who were also involved in accidents in practice, are all described as comfortable.
Donegal man Greene and Maeda were airlifted to hospital in the Isle of Man after the accident on the Ballahutchin Straight.
Greene was later moved to the Walton Neurological Centre in Liverpool.
The riders were in collision coming out of the Union Mills section about four miles onto the circuit.
Monday's serious accident follows two other serious crashes in the Isle of Man over the weekend.
Sidecar racer Tony Smith and his passenger Barry Pepperrell were killed in a practice race for the Pre-TT Classic Road Races on Friday night.
This was followed on Saturday evening by the serious accident involving sidecar crew Doug Dano and Cornell.