Sir Alex Ferguson and his squad were delighted to meet one of the world's greatest-ever players on Friday when Diego Maradona joined them at Carrington.
The United players trained in front of the newly-appointed Argentina coach, who was keen to see how Carlos Tevez is shaping up ahead of this month's international friendly against Scotland at Hampden Park.
Birthday boy Rio Ferdinand, 30 today, told ManUtd.com: "We were like schoolkids around Maradona. We were all clamouring to get pictures taken with him.
"He came and watched us train and I think the gaffer might like him to come down every day, the way it raised everyone's standards! Everyone was trying to impress him.
"He is one of my heroes, if not the shining beacon when I was a kid. I had all his videos and loved watching him. He was a great player - a great team player and a great individual player.
"It was nice to shake his hand. It made my birthday, actually. I hope he goes back to Argentina and tells people he saw a great player in Rio Ferdinand!"