The midfielder spent last season on loan at Rotherham with Warne, who would love to sign him again.
"You'd be very surprised to know I do like Dan Barlaser, but as we speak at the moment he is still a Newcastle player," Warne said.
"I am led to believe he is competing to be in the squad this weekend so until I know anything different, we can't proceed with anything.
"Even if we did bid for him, I presume there would be a line of people bidding for him and I don't know if we'd be at the front. I haven't spoken to Dan, I haven't spoken to his agent, I am just watching this space.
"I don't like speaking about players at other clubs, but it is not the world's best kept secret that I really like Dan Barlaser. If I get a phone call off his agent or Newcastle saying he is available and asking if I want to speak to him then I will definitely speak to him.
"But at this moment in time, I'm trying to be sincere, if he stays and gets into the Newcastle squad I would be absolutely buzzing for him because I know that's what he wants to do. There could be a chance we could get him if it doesn't work out for him but at the moment it doesn't seem that close."
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