Can morale boosters go below zero ?

[brunom14]

Thanks for your answers :-)

Well, to answer your questions spornybol, I'm level 13 and the way I got 0 blue's is the following:
1. I never get booster video's
2. I totally change my starting 11 every season and have the bad luck to always get new players having very poor morale
3. These same players have been losing their morale quite fast over the last 3 seasons, even after an easy victory.

I really cannot explain point 3. It seems some people are cursed with injuries, which is not my case. My problem is the morale, even by always making sure it's going down to poor before using my packs.