Vokes came off the bench against the high-flying Hornets with 11 minutes remaining to help them fight back to earn a 3-3 draw.
Defender Ben Mee is also in line for a return after serving a one-match suspension for the red card he received in the Lancashire derby against Blackburn Rovers.
Manager Sean Dyche could also welcome back Dean Marney following his absence with a calf injury. The game on Good Friday came too soon for the former Hull man but he is in contention to make his return against Forest.
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- Blackburn Rovers