Manchester United boss Jose Mourinho has dismissed concerns around Zlatan Ibrahimovic's age.

The Swede has joined United at 34 years of age.

But Mourinho said, "Yes, because first of all I know him very well. I always think there's our age in ID terms, but then there's our real age. Because, for me, the real age is not the age on your ID. That's just a date when you were born.

"The real age – the real ID – is your body, your brain, your attitude. And this guy is young, his body is amazing. The way he grew up playing the sports he did before football – especially martial arts – he was prepared in terms of his muscles and the mental point of view in a different way to the traditional football player, his DNA, his motivation.

"Let's be honest, he's very rich. He's made money all his career, he's won a lot of things. You only come to the most difficult championship in the world if you feel you can do it. If you don't feel you can do it, you go to America, China, stay in the French League one more season."