The 18-year-old featured in England’s behind-closed-doors match against the Czech Republic at St. George’s Park.
The youngster, who was a late call-up to Keith Downing’s squad for the game, scored twice in the encounter which the hosts won 5-0.
Walker smashed home England’s first goal of the contest after 23 minutes following Brandon Barker’s far-post corner.
The highly-rated teenager made it 2-0 just two minutes later, racing clear of the defence to slot a low shot past Czech goalkeeper Martin Otahal after good link-up play between Barker and Reece Brown in midfield.
Captain Ben Chilwell made it 3-0 to England just before the half-time interval, with Demarai Gray and Brown finding the target in the second period.
Following the match, Forest forward Walker took to Twitter to express his delight at making his debut for the England Under-20s.
Words can't describe how proud I am to have been called up for the England u20s. Amazing experience and great to get 2 goals for the team— Tyler Walker (@tylerjandrew1) September 5, 2015
Derby County-owned 19-year-old defender Farrend Rawson, who is on loan at Rotherham United at the moment, congratulated Walker on Twitter: