The Dutchman has struggled in Glasgow.
Celtic will be looking to get rid of Dutch wingman Derk Boerrigter this summer.
Celtic paid a reported £3 million fee to sign the winger from Ajax back in 2013, according to ESPN.
It seemed a good deal considering the player's illustrious past. He had been in the Dutch national squad in 2011 and he had been a star for Ajax in 2011-12, scoring 10 goals in 23 appearances. But he did have some injury trouble and a drop off in form which made Ajax sell him to Celtic so cheap.
Since his move to Glasgow he has been nothing but a disappointment.
He has suffered injury after injury, playing just 23 times in his first season and just three times last term He has not featured at all this season. In fact, his last appearance came in the Champions League defeat against NK Maribor in August 2014.
Since then he has been struggling with knee trouble and he has played 25 games for Celtic in nearly three seasons, scoring one goal.
Now a report in the BBC has claimed how much all of that has cost.
The fee is said to be in the region of £4.5 million regarding wages and transfer fees. That amount of money is a lot in the Scottish game and the Dutchman will likely go down as one of the worst signings in Celtic's history.
His contract with the club expires this summer and Celtic will no longer have to pay his wages after that with both parties surely hopeful to put this episode behind them.