Centre-back Jones will not be involved in England’s remaning friendly games after the centre-back was forced off midway through the first half against Germany and he has returned to Manchester United for treatment, leading Southgate to bolster his squad with three England Under-21 players.
Solanke, Cook and Gunn got the nod after helping Aidy Boothroyd’s Young Lions continue their unbeaten start to their Euro qualifying campaign with a 2-0 win over Ukraine.
Liverpool striker Solanke opened the scoring in Kiev, continuing the fine international form that saw him win the Golden Ball as England lifted the Under-20 World Cup in the summer. Bournemouth midfielder Cook skippered the side to glory in South Korea.
Goalkeeper Gunn, on loan from Manchester City at Norwich, comes in after Jack Butland broke his finger.
Demarai Gray and Dominic Calvert-Lewin had also been under consideration for experience.
Brazil offer England another chance to hone their three-man back line against elite opposition.
Chelsea’s Ruben Loftus-Cheek, currently on loan at Crystal Palace, was one of five players to make his debut against the world’s top-ranked side and produced a man-of-the match display.
Everton goalkeeper Jordan Pickford produced a string of fine saves on an impressive first senior appearance, but Joe Hart will be between the sticks against Brazil after Butland’s injury caused a rethink.
“It was just a straightforward goalkeeping drill, nothing out of the ordinary and just caught his finger awkwardly,” Southgate said.
“We would have played Jack in the game against Brazil. We were always going to play Jordan [on Friday night], but we’ll now play Joe on Tuesday.”
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