Hughes told West London Sport: "In the case of Hogan Ephraim we felt we wanted to protect the club's long-term interests.
"With the more senior players I'm not yet in a position to have those types of conversations with them.
"It's something we'll look to address at the end of the season. Until then we need to focus on our target, which has to be to get the points we need in order to stay in the Premier League.
"There are a number of players with situations to be resolved but they understand that at this moment in time our focus is on the games coming up."