Re: How to train players beyond level 20?

You need to rank them up in order to train them.

You need the same card or ranking cards (Mascherano) to rank them up.

To get to Rank 4 you need 5 cards or Macheranos to be certain you get the rank up!

Original Card (trains to 5)
Rank 1: +1 card  (trains to 10)
Rank 2: +1 card (trains to 15)
Rank 3: +2 card (trains to 20)
Rank 4: +5 card (trains to 25)
Rank 5: +10 card (trains to 30)

There is a whole thread on how this works. It will probably give you the answers:

https://answers.ea.com/t5/General-Discussion/Guide-Card-Ranking-Basics/td-p/13039487