The doctors working on Zlatan Ibrahimovic’s knees have been very impressed by their condition, and would like to study them after he retires.

Ibrahimovic had injured his cruciate knee ligament in April, and finally had surgery on it last week.

The operation was carried out by renowned sports doctors Freddie Fu and Volker Musahl, who were reportedly amazed by the strength and condition of knees and would like to look at them again after he hangs up his boots.

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“His knees are so strong that doctors said they had never seen anything like it,” Ibrahimovic’s agent, Mino Raiola, is quoted in Swedish newspaper Expressen.

“He has a knee that’s almost impossible for a football player with a 20 year long career to have. It was perfectly clean, there were no damage to it.

“Zlatan’s knee is so strong that the doctor’s want him to return after his career to do research on him. They work at the world’s best research institute for knees and ligaments.

“They research a lot about the subject and that is why they are better than everyone else. So after Zlatan’s career we will go back and open him again to research his ligament.”