Dundee United have upped their offer to Rangers for Charlie Telfer to £100,000.
The 19-year-old midfielder signed a three-year contract at Tannadice in June after more than 10 years at Ibrox.
A tribunal set up to rule on a compensation fee has been delayed until January due to lawyer availability.
United have already handed over £60,000 plus VAT, while Rangers are thought to be looking for around £200,000 for Telfer, who has made one start for United this season.
The teenager marked that occasion with a goal in a 3-0 win over St Mirren this month, while he made three appearances as a substitute in August.