Despite the news meaning the Black Cats will be without their best forward for at least a month, it is something of a boost to the club, given that initial fears suggested the Scottish international may be missing for a few months.
Speaking in his pre-match press conference today, interim head coach Kevin Ball confirmed:
The news is better than we feared.
It is four to six weeks which is good news for us. I've been downstairs and Steven has a smile on his face; albeit he realises that it's four to six weeks.
Hopefully he'll be back within that time and he'll be a great addition to the squad.
Quotes taken from safc.com.