I found a solution for this matter and it worked. I have 3 teams and in the early morning, I arrange 2 friendlies with team B and 2 with team C (team A is the major team of mine). Those scheduled friendlies will begin around 23:30 to 23:59 of that day. Therefore my team A reachs its max matchs of the day and no one could arrange a friendly with me.
When I need a firendly with others, I just cancel 1 or 2 of the arranged friendlies and he can invite me.
Hope this will help for you.