Cameron Carter-Vickers has agreed personal terms on a permanent switch to Celtic, according to reports.
The Hoops now have three weeks to thrash out the deal with Tottenham before other clubs can can make their move for the stopper.
The Daily Record report the USA international has his heart set on a full-time move to Parkhead but the clock is ticking on Celtic exercising the option in his loan agreement.
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It's reported the Parkhead side will shell out an initial £6million fee for his services and a deal could rise as high as £10m.
It's believed that June 15 is the cut-off point that allows other clubs to enter the race for the defender.
Bournemouth and Fulham - who just secured promotion to the English Premier League - are said to be watching the situation very closely.
Carter-Vickers has been a key player for Ange Postecoglou since his arrival on loan at the club last summer.
The Hoops stopper has played 46 games in all competitions, netting four goals.
The 24-year-old has struck up a solid partnership with Carl Starfelt as Celts landed a domestic double.
They reclaimed the Scottish Premiership title from Rangers and also lifted the Premier Sports Cup.
Winning the league will see Celtic dine at Europe's top table next season after securing automatic entry to the Champions League group stages.
