Volker Musahl - one of the doctors who operated Manchester United striker Zlatan Ibrahimovic - has dismissed claims from the attacker's agent Mino Raiola that they want the 35-year-old to return to Pittsburgh after his career so they can research his knee.
Ibrahimovic required surgery after sustaining a cruciate ligament injury during United's 2-1 win over Anderlecht in the Europa League in April.
Following the surgery Raiola claimed the doctors were so impressed with the condition of the ex-Sweden international's knee that they wanted to study it at some point in the future.
"It was a routine surgery. There were no complications," the German doctor told Die Welt.
"Zlatan has a very good bone structure and his knee is absolutely in a good condition. But it is a bit of an exaggeration to say it will be a research object."
"I cannot give an accurate prediction as to how long his recovery will last," he added.
"Our goal is always to help the athletes make a quick and safe comeback.
"Ibrahimovic was quite pleased with the way the surgery went. He is very strong."
