Palace rejected an approach from Rangers this week for Rak-Sakyi.
"He's a player I liked at Southampton. We tried to take him there and it didn't quite happen," Martin told Sky Sports.
"So, he's a player I like and I think he's a player the recruitment staff like. But, how far that's gone, I'm not too sure.
"He's a really good player. We look at all sorts of different profiles who we think can help the team. It doesn't necessarily have to be the one type of profile."
Martin added, "Players are very different, we just need players with the right mentality that are desperate to come and play here. We will see where we end up in four weeks' time.
"There's a lot of players we'll be linked with. Some wide of the mark, some very close and some spot-on."