Several players have been linked with moves away from St Andrew's, amid speculation over the club's financial position.
Clark has admitted that he is unsure over any possible departures.
"I don't know, honestly, I don't know. I just think I have got some good, talented young players who will be catching people's attention. But I am hoping that we don't have to go down that route this January," Clark told the Birmingham Mail.
"If it was to happen again with another couple of players, it's difficult to keep going to the well and bringing more out. You can't keep doing it on a repetitive basis. You need a bit of help.
"Hopefully they [other clubs] might keep looking at the young players and think 'they need a bit more time to develop' so we can keep them here. As I have said many, many times, I just get on with the football side of it."