The Arsenal star, 20, hoped to be ready to return this month following surgery on a stress fracture in his right ankle last summer.
But he is now sweating on a series of tests this weekend revealing how much longer he will be out.
England ace Wilshere tweeted last night: "It is true I have had a setback. I can't tell you how long I have been set back because I don't know! I am very annoyed but will stay strong."
Gunners boss Arsene Wenger is convinced that Wilshere will not be back before mid-March at the earliest.