The Lilywhites' boss said: "We're trying to do one or two things, but there's nothing anywhere near concrete at the moment.
"There are a few Manchester United players out on loan at the moment and I am not going to go knocking on his door for five or six.
"If I was to get the one, it would have to be the right one and a really good one, so I am not dismissing it."
Source: Team Talk