Sunderland have given Daryl Murphy permission to speak with Celtic ahead of a proposed switch to Parkhead.
The two clubs came to an agreement regarding a fee for the forward on Thursday and are keen to push the deal through.
Murphy is therefore free to talk terms with the Hoops and put the finishing touches to a Scottish switch.
"The clubs have agreed terms, it is now down to the player," said Sunderland's assistant manager Eric Black.
"He has been given permission to go and speak to them, which I think he was doing last night.
"We should have an update on that today (Friday), with a bit of luck."
Murphy, a Republic of Ireland international, joined the Black Cats from Irish outfit Waterford for £100,000 in June 2005.
He has, however, been unable to hold down regular first-team football at the Stadium of Light and spent the second half of last season on loan at Ipswich Town.
The 27-year-old is one of a number of players deemed surplus to requirements by Sunderland boss Steve Bruce, as he attempts to re-shape his squad ahead of the 2010/11 campaign.