And while Trollope remains hopeful that at least one of the quartet may feature against the Addicks at the Memorial Stadium, he also has doubts over the fitness of Jeff Hughes and Wayne Brown, who sustained fresh injuries in the midweek game.
Trollope said: "The fact the game is on a Monday has been a godsend this week. We had about eight senior players in the treatment room on Thursday, but we are hoping we might get two, three or four of them back in time for the game.
"But we also have fresh injuries from Tuesday night, when Jeff Hughes twisted his knee, and Wayne Brown's ankle is swollen and sore."
Rovers are hoping to bring in a striker on loan ahead of the game to boost their resources.