Yeah, grass cutters are also dreaming to play football and they are too old for the U21 academy now, so he decided to enter the Senior Centre (the old building next to your U21 academy) and get a training from younger players...
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You also get these 33 and 34 year old retiring players if you have some players that you let the contracts expire at the end of last season and they are there to make sure your team has 14 players available in your squad to play games if you didnt sign in at the beginning of the season.
That's kind of useful. But wouldn't it be better to also get some compensation too like some coins or money; especially from retiring players.
EDIT just saw July 4 explanation.
the server sometimes fills up your team with the missing players at the start of season since you do not renew contracts to players