The West Yorkshire outfit are one of the biggest clubs in England and regularly attract over 20,000 spectators at Elland Road for Championship games.
Despite not having featured in the Premier League since 2004, Leeds remain one of the best supported clubs in England.
Gallacher, who played for Coventry City and Newcastle United among other clubs in his career, salutes the Whites’ fan power.
“The crowds that back Leeds are phenomenal and I see they will be bringing up to 7,000 with them on Saturday,” the 47-year-old wrote in the Lancashire Telegraph.
“It is the kind of backing that suggests to me that, if they do get back up into the Premier League, they could still be a force.”
One has to admire the Leeds fans, who have endured many disappointments but still retain their belief in the team.
Things are not looking so rosy for the Whites at the moment as they are currently 15th in the Championship table with 20 points from 17 matches, just four points above the relegation zone and eight behind sixth-placed Brentford.
On Saturday, Leeds will take on Blackburn Rovers at Ewood Park in the Championship.