Blackman, 23 has scored 14 goals this season in all competitions and will no doubt be exited at making the step up to the top flight after only joining the Blades last summer in a six figure sum.
“I’m really looking forward to it and I’m veexcited,” Blackman told Reading FC Player. “I met the gaffer last night, he was fantastic with me and I couldn’t have asked any more from him and [director of football] Nicky Hammond. I can’t wait to play - hopefully I can try and get involved as soon as possible.”