Anthony Crolla is targeting a comeback in May after fracturing his skull and breaking his ankle in December.
The 28-year-old lightweight was hit by a concrete slab as he tried to apprehend burglars in Manchester.
"I'm 100% certain I'll be back. I honestly think I can be ready for May, late May," said Crolla.
His injuries forced him out of a WBA world title bout against Cuban Richar Abril, 32, who will now face Liverpool's Derry Mathews in March.
Crolla, who has won 29 of 35 professional fights, admits he faces some big challenges before he can guarantee a return to the ring.
"The sparring is the thing I need to be careful with," he added.
"I'll probably need brain scans even before I return to sparring.
"Because I've gone through this and suffered this bit of heartache, I'll be even more focused than before."
Promoter Eddie Hearn said Crolla was "lucky to be alive" following the attack in Chadderton, Greater Manchester.
He needed a plate and pin in his ankle and 12 stitches in a head wound.