Cristiano Ronaldo spent so much time on the training ground that Sir Alex Ferguson ordered him to leave, reveals former team-mate Nicky Butt.
The former Red Devils boss was worried the United star would over-work himself ahead of games with his relentless practice to perfect his techniques.
Butt made way for Ronaldo in the 61st-minute as the future United legend came on to dazzle in his 2003 Old Trafford debut.
In the book 'Viva Ronaldo', Butt reveals it wasn't just pure talent that fuelled Ronaldo's rise to the top but also his commitment to the game.