Harewood suffered the setback in training this week after scoring in the win over Wolves at the weekend.
Down and out: Harewood (left) is expected to be out for six weeks
Ludovic Sylvestre is doubtful with a hamstring strain as is Chris Basham with a knee problem.
Provisional squad: Kingson, Eardley, Cathcart, Crainey, Evatt, Adam, Vaughan, Varney, Taylor-Fletcher, Campbell, Grandin, Phillips, Edwards, Carney, Euell, Sylvestre, Keinan, Southern, Basham, Ormerod, Halstead.
CLICK HERE FOR THE WEEKEND TEAM NEWS IN THE BARCLAYS PREMIER LEAGUE Explore more:People: Marlon Harewood, Ian Holloway