The Shrewsbury Town manager has received the treatment between Tuesday and Thursday this week as doctors believe it will help combat the illness.
Tomorrow marks a month since Cotterill was admitted to hospital in Bristol and while the Shrewsbury boss has shown signs of progression, he has also endured setbacks on the road to recovery.
The Town boss remains busy as ever, controlling the details of training and match opposition from his hospital bed, and there remains hope that he could return home from hospital next week.
Wilbraham said: "We're in contact and speak every day, he's had a bit of a tough week this week.
"They decided to give him a three-day high dose of steroid hit intravenously over three days.
"They are hoping that will give him the boost to kick on and recover from it.
"He's having that done as we speak over the last three days, hopefully that will send him in the right direction.
"He'll still be in hospital for the rest of this week, hopefully it could be next week he comes home but that's only hopefully, we have to see how these things go obviously, with the type of Covid he's had.
"He's still speaking every day and organising training, which is incredible."