I don't know if I allowed to do this, posting it here and show the account's name of the cheater.
But in my league I found a cheater that use multiple accounts to get my rank in the table down, using some accounts then use training camp in order to make me lose the game (good things that I'm not). He also use the multiple accounts to buy player in transfer market then sell them with low price to the "suspected account".
Here is some of the pictures of screenshot from my league I currently in.
I already reported them all!