Aberdeen say there has been no contact from Sone Aluko's agents - or Rangers - about their former forward's potential move to the Scottish champions.
The 22-year-old Nigeria international left the Dons in the summer and is now in his second week on trial at Ibrox.
Aluko impressed watching Ibrox manager Ally McCoist by scoring in a behind-closed-doors match against St Mirren.
But Aberdeen insist they are due compensation in the region of £200,000, which could hold up any deal.
Aluko, who also spent a short spell on loan with Blackpool, moved to Aberdeen from Birmingham City in September 2008 for £50,000 after a successful loan spell at Pittodrie.
And the Dons believe that, under Scottish Premier League rules, they are due compensation should Aluko agree to sign for Rangers.
Despite the player being a free agent, Aberdeen say a fee would be required for helping develop his talent.
A Pittodrie source told BBC Scotland last week: "We are fairly confident of our case.
"Our fans would never forgive us if we let Rangers walk all over us on this."
Any transfer case could be settled by a tribunal if the clubs cannot agree a fee.
Prior to the 3-1 friendly win against St Mirren, McCoist had told his club's website that Aluko had been "looking lively in training".