Celtic have secured youth product Kieran Tierney, CelticFC reports.

The talented 18-year-old signed a four-year deal with the club after breaking into the first-team squad on the opening day of the season.

His first competitive debut came against Dundee in a 2-1 win back in April. The youngster made a second-half substitute appearance for the Hoops and hasn’t looked back since.

After an impressive pre-season for the Hoops, Deila rewarded Tierney with his first competitive start came on the opening day of this season. The youngster impressed the Celtic faithful at left-back, after an injury to Mulgrew and suspension for Izaguirre gave the Scottish teenager his opportunity.

Success wasn’t going to be easy for Tierney, who suffered a broken leg at the beginning of the year. If anything his meteoric rise to make the first-team bench regularly from such a horrific injury shows what a determined and great talent Celtic have in their ranks.

The youth academy graduate spoke to official website after putting pen to paper.

“I’m delighted. I have been here 11 years already so to get a good contract for another few years at least is fantastic, and I’m happy to commit my future to the club I love. “The setbacks make the success all the better. After having the leg-beak and to get back to where I am just now is brilliant and I’m grateful for everything.

Tierney has relished working under manager Ronny Deila, and having signed a new contract he wants to repay the Norwegian’s faith in his ability by continuing to develop and work hard on the training ground.