The Aston Villa pair are available to Dean Smith this Friday.
Grealish missed the 2-1 win over Bristol City last time out, while the Aston Villa hitman picked up an injury in that game which made him a doubt for Friday.
But according to Villa's official website, Dean Smith has both players fit and available for the trip to the Trotters.
It's an excellent boost for Smith's side, who are chasing Premier League promotion and having two such influential players available could be massive.
The West Midlands side, enjoying an eight-match winning streak, are fifth in the Championship with a five-point cushion.
But Derby County, six points back in eighth, have a game in hand and with only four matches to go for Aston Villa, Smith's troops can ill afford any slip-ups at this stage.
Elsewhere, the club's official website also reported that Tommy Elphick has returned to training following a month-long absence, while Kortney Hause is 'responding well' to his treatment.