WATCH: Man United old boy Anderson knocks out team-mate in training
Where did it all go wrong for Anderson?
In 2008, a year after Alex Ferguson signed him for Man United from Porto, he followed the likes of Lionel Messi, Cesc Fabregas and Sergio Aguero in winning the Golden Boy award.
He had the world at his feet.
After eight inconsistent and ultimately underwhelming years at Old Trafford he eventually moved back to his native Brazil, signing for Internacional in 2015.
Now here is punching team-mate, William, in training…
Supposedly, that seemingly innocuous blow briefly knocked out William.
Internacional have since suspended Anderson over the incident and his future at the club has been cast in serious doubt.
He is a Gremio boy at heart after all.