I think both managers should have to allow a friendly match in order for it to take place. It is highly annoying, & sometimes sabotaging when a friend schedules a match while you are away from the computer & the match happens without your knowledge. You come back to prepare for a league match, Champions match, etc... & suddenly all your starters have low condition & possibly some injuries. It is incredibly unfair to the one who did not know about the match & did not agree to it.