Zarate has managed just 71 minutes in a QPR first team shirt since his early January arrival on loan. He has only managed just four second half substitutions for the Hoops against Burnley, Southampton, Sunderland and Hull, three of which resulted in losses.
QPR are thought to be picking up his full £40,000 per wages plus a loan fee meaning his fifteen week stint so far has cost the club around £750,000 which is just over £10,500 for every minute he has spent on the pitch.
The Loftus Road outfit considered sending Zarate back after discovering his shocking lack of fitness but he was placed on an intensive fitness regime before suffering a knee injury in March.
He is expected to return to West Ham in the summer and take part in pre season training with the Hammers. Zarate signed a three year contract with West Ham in May 2014.