not fullfilling expectations does not mean u willl be sacked, if u missed out on ur expectations by a small margin then u will only receive little less money for the next season, if you do very poor with expectations then your future will be discussed by the board. you can also be sacked during the season if you do not obey the rules or if your results are so poor we feel we need to let you go. if you are sacked because of the results then you can still apply for another job.