I have players saying that all the time, but i've never notice it make a difference to their on - pitch performance. But if it does start affecting them, new contracts should help.
they will eventually stop moaning, normally happens when you are on a good run of form and you have not publically praised your best players recent performances and or when you are not on such a good run of form!
praising is a great part of team morale and will prevent this from happening in the future, if you win 1:0 or 3:2 (NB, if you win) say that you are delighted with performance or pleased! to everyone for the next couple of games!!
its joke in refernece to harry redkanpps talkin to a young player underperforming,
after harry told him to stop messing with his hair! the player concentrated on his football more and had huge improvement in performance! lol was just joke