The 24-year-old will become a Leeds player after impressing Neil Warnock during his loan spell from League Two side Southend.
Hall, who can play on either wing is set to sign a two-and-a-half-year deal next week.
During his loan spell, Hall has started on two occasions and made three sub appearances including a vital contribution away to Huddersfield where he picked up two assists.
Speaking to the club's official site, Neil Warnock said:
"When we brought Ryan in I said I believe he is a player with potential for a big future.
"He had only played once this season and his match fitness, and bringing him up to speed was the biggest priority. I'm sure during the length of his contract Ryan will have the opportunity to establish himself at this high level, and you can see that from his contribution at Huddersfield a few weeks ago.
"It's not just experienced players we are looking for to add to the squad, and if we feel there are youngsters like him available at the right prices we will look to the future as well."
Although Hall has shown his ability to cross a ball, Leeds fans haven't really seen enough of him to get excited over the signing.
His passion to do well is good to see but until he gets a long run in the team, Leeds fans can't judge him on whether he can make the grade at this level. At the moment there's no obvious sign he will start a game and become a regular first-team player.
This deal looks like a good one for Warnock who can have an option from the bench, which is something he's not had so far this season.