Walker’s original contract was due to run out at the end of this month, according to Transfermarkt.co.uk, but the youngster will remain at the City Ground for the next four years at least.
On Tuesday, Forest announced on their official website that the 18-year-old forward has put pen to paper on a new four-year deal with the club.
“The manager approached me and said he wanted to offer me a new contract because of how well I had done in training and in the few minutes that I got on the pitch,” Walker told Forest’s official website.
“He has really backed me and I’ve responded to that. I wanted to get in his thoughts early on. I really enjoy his training sessions and he makes it easy for me to play my best football.
“The amount of confidence he’s given me, staying behind after training sessions to put on drills that are going to benefit me, is brilliant and I really enjoy working with him.”
Walker is considered as one of the most promising young strikers in the Championship and broke into the Forest first team in the recently concluded 2014-15 season.
In seven appearances in the league for the Reds, the 18-year-old scored one goal, had a pass accuracy of 77% and a shot accuracy of 60%, and won three headers and two dribbles.
The English youngster impressed in those seven matches, and he will hope to get more chances next season.