The Australian star scored nine goals in the early stages of the Premier League season when the Toffees were really struggling and Moyes admits that his performances helped the Merseyside club when they needed it most.
But the Scottish tactician said the fact that Cahill was struck down with a foot injury during the Asian Cup, forcing him out for much of the second part of the campaign, may teach him how to manage his body as he gets older.
“Tim is an important player for us and most seasons gets us nine or 10 goals. The first half of this season he was in good form and he was scoring goals to win us games and win us points and that really helped the team,” he told the club’s official website.
“He has not been the same since the Asian Cup and has had injuries, but maybe there are lessons there for him about how he needs to look after himself now he is the age he is.”