Midfielder Butler has missed the last two games due to a knee injury, while striker Dobbie (ankle) proved his fitness by coming through 90 minutes for the reserves unscathed in midweek.
Swans manager Paulo Sousa is still without Mark Gower and skipper Garry Monk, although the latter has returned to full training and aims to return on Boxing Day.
Midfielder Gower has been sidelined since the end of October with a hamstring injury, while Monk has spent a similar spell in the treatment room with a calf problem.
Sousa has no new injury or suspension problems as his side look to bounce back from last week's home defeat to Nottingham Forest.
