#5 Choosing quantity over quality
With fans expecting their clubs to compete for all the trophies they participate in, managers need to have sufficient strength in depth to keep the squad fresh.
However, this also carries the risk that you end up buying too many players who possess some quality but lack that spark which could prove to be the difference in the big games.
For doing well in the big competitions, it is essential to have those players who rise above their peers, and the challenge for the manager is always to have the right balance because too much star potential can also lead to conflict.
It is important to have leaders in every department of the pitch as well as off it as it can rub off on teammates as well. A club like AC Milan lack leaders on the pitch at present. The same can be said about what Tottenham Hotspur did when they let Gareth Bale move to Real Madrid.