Di Canio insists both strikers aren't up to the job at Juve.
Discussing the weekend's 1-1 draw with Sassuolo, Di Canio told Sky Calcio: "Luciano (Spalletti, coach) explained it before the match: 'You can't catch (Jeremie) Boga in the first ten metres'.
"I understand, but you have to know how to catch him, stop the ball, and he also passes him so much that he then puts him back."
Pausing for a moment on who will be left out, he bluntly stated: "The rejection of David and Openda is definitive. These two can't be here even if we concede less."
On Francisco Conceicao, Di Canio also said: "He gives you an idea, but if he doesn't blossom... A lack of knowledge of football decisions, we've said it all because that's the essence.
"If Juve want to develop, I'd do it, and I'd keep him as a reserve. There are players whose attitude won't let you down; he has it even if he were to start from the bench because he's a professional, but Juve needs someone with fire like (Kenan) Yildiz."