Have to agree with Blue here. If the fans aren't hearing about it... then in most people's mind... it's not happening.
All they'd have to do is drop a press release saying we signed so and so... he'll be transfered here to start his career.
If they ran one of those with every signing, it'd let the public know they are working hard... and they wouldn't even have to get the figures on the contract out there.
Unless they are going after the highest profile guys, fans don't really care. Putting out a press release saying you signed a 16 year old noone has never heard of does matter to most people.