Manchester United boss Sir Alex Ferguson admits he can't trust his bigmouth players to keep his tactics from getting out.

Fergie says he's been forced to change his training approach because of his whispering players.

"Why should we let anyone know what the team is?" he asked. "It's straightforward and why I never name the team until Saturday now.

"I used to name it on Friday when I first came down but it didn't work. It was always in the papers.

"Everything we do in training is mixed with a variety of different players playing in different positions because they tell the agents who tell the press. It gets so dead easy nowadays - too easy.

"Twitter is one thing but they tell agents and they tell other people. Maybe they're even representing a player in the team you're playing against too."