The yourth team generates two players, one good and one average, the the better player will cost you a lot of tokens the latter you get free!, you will see to little signature marks appear at the very bottom of you squad1, you cant miss them as the game will tell you, you have a unsigned player in your team, you do need to sign them or release them within 7 days or they will be automaticly released.
Dont go getting you hopes up to high because the quality value to level rario is poor!, but the token player will be a good trainer!, but he is expensive (token wise).