Zubar suffered a swollen ankle during the 2-0 defeat against Arsenal at the Emirates Stadium last weekend - a result which pushed them to the bottom of the table.
If Zubar is ruled out, then Kevin Foley is the obvious candidate to replace him.
Stephen Hunt is unlikely to have recovered from the calf injury which saw him miss the defeat against the Gunners.
But fellow midfielder Dave Edwards could be back in contention after recovering from a groin problem.
Source: PA
Source: PA