Leeds United manager Simon Grayson has told his players to refrain from using the social network site Twitter.

The boss reacted by speaking with his players after news of Davide Somma's cruciate injury appeared on Twitter on Friday evening before the manager wanted any announcement making.

"I was very disappointed with the way it came out," said the boss. "It wasn't fully confirmed, but suddenly we had newspapers and other people ringing up asking if it was true.

"We have a club policy that players using social networking sites are asked to follow. We've never encouraged or discouraged use of sites like Twitter and I've no problem with interaction with the fans, but we have laid down guidelines about things that we don't expect the players - or staff for that matter - to talk about in public.

"We brought in the guidelines last season to help the players and the club, and to avoid situations like this, but I spoke with the players after this and have told them I don't want them using Twitter.

"There are certain things within football clubs that shouldn't be discussed in a manner like this - club business, transfers, injuries, team selection - and in the case of Dave's injury I wanted it to come out in the right manner when everything was 100 per cent confirmed and all the right people knew.

"The guidelines are there for the lads to follow, but if they can't be followed then I'm simply not having it and I have told them I don't want them using it."