Unfortunately, you cannot block friend request. What I usually do (to persistent friend requests) is simply ignore it, of if he persists in repeatedly requesting/cancelling/requesting again, you can troll him back by adding him, check his fixtures for the season, and intentionally play a friendly against him 16 mins before every single competitive game of his.
I am sure he will be scared off forever.
PS. You can also intentionally stay as friend to support all his opponents every match too. Pretty sure no manager could stand that.
Lmao This is funny mate. Hahaha
Sorry for opening new accounts. I forgot my old’s password.