Hi guys, I am trying my first team ( Yankees) of course being from NY and all

Anyways, I have a few players on the DL that have no time left on DL but still have days, weeks even left for their injury to heal. What do I do? DO i leave them there or do I place them somewhere. My catcher had received an injury and he is going to be out for a month so I though by putting him on a 60 day DL would free up a spot on my 40 man roster which i believe it did but cant find a player FA or trade that would be good enough to replace him. He has been doing nothing for me even though he is rated pretty high. Can anyone tell me what to do? Thanks...