Shawcross out for two months
The central defender is to have the operation next week having suffered a recurrence of the back problem that troubled him last season.
A club statement said: “The club had hoped surgery would not be necessary and that the summer break would provide a solution. “That initially appeared to be the case, but the harder Shawcross pushed himself in pre-season the more discomfort he found himself in, leaving no alternative but for him to undergo the operation.”