Denton had been under contract until next summer but has put pen-to-paper on fresh terms that will keep him at Elland Road until at least 2019.
The 20-year-old from Dewsbury is a graduate of the Leeds United Academy and he scored the winner on his full debut in Tuesday night’s 1-0 EFL Cup victory at Luton Town.
Denton said: “This week could possibly be the best week of my life. I’m so grateful to the gaffer and his coaching staff for trusting me for my debut. To score was a dream come true and this just tops it off.
“I signed a one-year deal at the start of the season and it was an incentive to do better things and keep trying to impress the gaffer.
“This new contract now gives me a stable footing and gives me something to build on.
“I don’t want Tuesday night to be the be all and end all – I want to carry on doing good things for Leeds United. The experience on Tuesday will do me good but the hard work starts now.
“My next chance will come when it comes. I’ve got great trust in Charlie (Taylor) as he’s a great player, but I’ll be prepared if my chance comes.”
Looking back on his debut goal at Kenilworth Road, Denton added: “All of the lads have been hammering me – I haven’t stopped smiling since the final whistle!
“But I wouldn’t be here without my family, who have supported me throughout, my coaches and school teachers – everyone who has supported me.
“I’ll keep working hard on the training pitch, keep showing the gaffer what I can do and how determined I am to get to where I want to be.
“It’s always been a dream to play for Leeds – I’m a fan myself. I used to come to the games with my dad back when we were in the Champions League and the Premier League.”
Meanwhile, AS Roma 17-year-old Dario Meadows has joined United’s Development Squad on a season-long loan.
Meadows is primarily a winger but can operate in a number of roles, is capped by Italy at Under-16s level but is also eligible to represent England, where he was born to an English father and Italian mother.
“I’m very excited about this new opportunity,” Meadows said. “It will be a lot different to where I’ve been used to playing at Roma, but I’m really looking forward to it.
“Leeds have great history and are one of the best clubs in England for producing young players, I’m really happy to be here.”