do you have an issues to beat strong team and there is some important mactch comming ?
Here is symple solution:
1. before season start add as much strong players to your friend list as possible - most of them will accept your request and they will be happy like oohhhoo someone want me as a friend.
2. make your squad big enough - reach maximum limit of players, quality of sub. players is not important at all.
3. shortly before important match with your strong opponent, send a friendly match request - players dodn´t spend in the game whole day so most of them will not notice it.
4. use your reserve team for this match, set tactic as the most aggresive, attacking, with hard tackling, pressure - you will injure him couple of players
5. play match, after match switch back to your top 11. Your opponotent will log in, to play a match against you - if he will do. and he will be happy to see all his players, very tired and many new injuries
6. enjoy your important match against team which just come out from hospital : )