Sunderland manager Martin O'Neill says defender Wes Brown is waiting to discover the severity of a knee injury suffered in Sunday's pre-season friendly.
The 32-year-old former Manchester United man was due to have scans to assess the extent of the damage he suffered during the 3-2 Peace Cup victory over Groningen at the weekend following the Black Cats' return to England.
Manager Martin O'Neill initially feared one of his most experienced players could be sidelined for months, but he was more optimistic on Thursday as he awaited the results of the medical tests.
O'Neill said: "He will be assessed today. He is doing some scans and I'm hoping that the news is going to be okay.
"But his knee is really swollen."
O'Neill, whose side play their latest pre-season friendly at League One Hartlepool on Friday evening, revealed the decision to give 28-year-old Michael Turner permission to talk to Norwich was taken before misfortune struck Brown.
The former Hull defender was in East Anglia on Thursday for a medical and to thrash out the fine details of the proposed move.
O'Neill said: "Norwich had asked us about it before Wes' injury and so having given permission for Michael to go down there and the clubs having agreed a fee, it was just ironic that Wes got injured at the time.
"We will see what develops down in Norwich, but I am hoping that Wes' injury is not as bad as it might have been.
"But we do have a number of centre-halves at the football club at the moment, and priorities in strengthening are probably elsewhere."