Leigh, 17, this evening put pen to paper on a three-year deal which runs until 2024.
The teenager was a regular through pre-season in Frankie McAvoy's squad, featuring in a number of the friendlies - including against St Johnstone, Bolton, Accrington and Wigan.
It had been claimed in the media that several Premier League clubs were eyeing him, including Everton, West Ham, Leicester and Arsenal.
Things can change quickly in the transfer market and Preston North End have come to life after Huddersfield win
PNE player ratings vs Luton Town as Ben Whiteman and Liam Lindsay steal the show in hard-fought win
Match Report: Luton Town 0-1 Preston North End - Brad Potts stunner gives North End first Championship win
Preston North End boss felt his side found a way after wonder goal sees them past Luton Town
Luton Town boss says best team didn't win after Championship defeat to Preston North End
However, Ashton-on-Ribble lad Leigh has now signed with his home town club and is delighted to have done so.
Leigh told iFollow PNE: I'm over the moon, obviously it's a proud moment for me and my family.
"I've worked hard since I started playing football when I was very young so I'm buzzing with it.
"It's been a long time coming, it's my home town club.
"I'm buzzing, I'm thankful for it as well. It's a huge show of faith from Frankie so I'm happy."
Leigh made the bench once last season as a first-year scholar, that for the 2-1 defeat at Millwall in March.
He joined PNE's academy at Under-14 level after previously being with Liverpool.
PNE head coach McAvoy said: "I'm delighted he's committed his future to the club. He's a Preston boy and I've been delighted with his progress so far.
"The most important thing is we need to make sure that young players have an opportunity and a chance to develop, that they become part of our squad, then we try and tie them up as early as we can.
"Lewis is one of them; he’s done really well. We’ve involved him throughout pre-season and I’m just delighted that he’s managed to stay here and he’s got a big future, and hopefully that big future is with Preston North End."
Thanks for reading. If you value what we do and are able to support us, a digital subscription is just £1 per month for the first two months. Try us today by clicking here