Mark Molesley says he will have to balance the need to rest some players, while ensuring he fields a side that meets the competition’s regulations against Colchester United on Tuesday night.
Blues have come through a packed October of seven games and will play their fourth consecutive Tuesday night fixture.
Meanwhile, the competition rules state that a club must field at least four qualifying players* of the 10 outfield players.
At his pre-match interview, Molesley said: "We have to balance the fact that we’ve just had extra time, a hell of a lot of games, a lot of travel and some players will need to rested with another tough away game on Saturday.
"We have to get the balance right.
"There’s some challenges of resting some but also fielding a team with the right criteria for the competition.
"But we’ll use the game as best we possibly can.”
On Harry Seaden and Harry Phillips’ chances of playing…
"Certainly they [Seaden and Phillips] have been patient and deserve their chance and they’ll get that tomorrow night."
"He’s in the very early stages of just joining back into training but hopefully he’ll be able to play some part in the game."
"Unfortunately, that’s a little bit more long term than we would’ve liked.
"His return to play [following a scan] was four weeks and we’re a week into that.
"That’s more long term than we would’ve hoped and it’s a tough one for us to take.
"He’ll be back at Bournemouth and he’ll get good treatment there."
"He joined in part of training today and we’re hoping he can pass a fitness test to play tomorrow."
"It’s just too soon for him, he’s not back in first team training yet."
"Sim is training hard, working hard and we’re looking forward to having him to choose upon soon."
*A qualifying player is classed as one that:
- Started the previous game
- Starts the immediately following game
- Is in the top 10 list of players for highest number of starting appearances in first team fixtures at the club
- Has made 40 or more starting appearances in first team fixtures
- Is on standard loan from a Premier League Club or any EFL Club operating a Category One Academy.