Can you change a players value in FIFA 08

Yes, it is possible to change a player's value in FIFA 08. If I remember correctly, it is under the team management section or edit player tool. From there the player's attributes can be changed. You can upgrade their stats.

For example, Eduardo (Arsenal striker), is left footed in real life. You can change that.

You can also change player's growth rates. There are many options like early bloomer, late bloomer etc. This will affect the player's value in manager mode.

If you are not sure about changing growth levels, then you can just change their stats.

For a defender you can increase his tackling,marking and aerial ability, which will make his value increase. Similarly for mid-fielders, short passing,long passing,stamina etc will affect their value. Hope this helps.