"?" well first say the same as the mate, that's no possible, for logical privacity rules and... well...
I'm not agree at all... I was thinking in this option, but in different way, for example depending of the level of your friends, give the option to other managers to work as 2nd coach, and, been in his account, train your team for you, without login to your team....
We know that teams have some different trainers... one for GK's one specific for others, so... maybe Nordeus can give me an option to puch a button, and train my friend team, in lower % or something like this...

....(-.-)' something.... like this LOL