It is believed that the Greek side have agreed personal terms with the midfielder and aim to take up the final year of his contract instead of paying a fee.
But club administrator Andronikou has warned them that if they do not pay up they could lose out to one of the other interested parties.
"Athens are making noises and I have been in direct contact with them," he told The News. "They know our position and they know they have to write a cheque. Unfortunately that has not happened yet.
"Diop is available for 1million Euros and if they want him they will have to pay that amount. We have absolutely no intention of giving him away."