The 19-year-old watched Charlton's 1-1 draw with Blackburn Rovers on Saturday and the Ivorian is looking forward to the chance to play regular first-team football.
"I'm really looking forward to meeting the team and working with the manager," Razak told Charlton's official website.
"It's been hard for me to get into the first team at City, and I come here hoping to prove myself with what I do on the pitch and hopefully I can do that on Tuesday.
"This is a very tough league, but you have to be ready for it. This is my third loan spell in the Championship so I'm ready for it."