Fletcher has stepped up from his U18 role to take charge after Ruben Amorim's dismissal.
Fletcher's sons Jack and Tyler have both been involved in the first team this season under Amorim. Jack has featured in three Premier League games this season, while Tyler has made the bench.
Fletcher, on whether his sons will make tonight's squad, said: “I’m not going to give anything away.
“They were in the training group on Monday, that was already arranged before I got there. They’ve been in the squad recently.
“We’ve got some players coming back from injury so we’ll assess that tomorrow. We still have to assess a couple of players tomorrow because of the short turnaround from games.
“They are in the periphery squad but whether they make the match squad, I don’t know yet. That remains to be seen.”