Tottenham want to secure Kyle Naughton to a new contract.
Portsmouth boss Steve Cotterill admits the talks are stalling a loan deal for the defender.
He said: "Kyle is definitely somebody we are hot on and we have spoken to him and very much he is keen to come.
"I think perhaps Tottenham want him to sign a new contract before he comes out and if I am honest that might be the small stumbling block at the moment.
"So at the moment, I don't know if anyone will come in before Palace."