Wilbraham will play no further part in the Canaries` push for promotion after being ruled out with a back injury.
Fellow striker Chris Martin is on the mend but Saturday`s game will come too soon for a return to the first-team squad.
However, there is some good news for Lambert with the international break allowing defender Zak Whitbread and on-loan Arsenal midfielder Henri Lansbury to return to fitness following knocks.
Midfielder Andrew Crofts and striker Simeon Jackson have both returned from international duty fit with both likely to feature against Alan Knill`s side.
Lambert has loanees Sam Vokes and Dani Pacheco at his disposal after the duo got a week`s training under their belts.
Source: PA
Source: PA