"Everyone has an opinion. What we work on in training is very match-specific and match-related. It's just one of those things and there are too many opinions knocking about nowadays.
"There are not too many people who speak highly of goalkeepers. They tend to want to put them down."
The Aussie added: "He is strong minded enough to get on with his job and understand what happens. It is a shame that it happens because last season he produced some massive saves that helped us win games and people tend to forget them.
"Then the press jump on it and want to criticise him and say someone else is coming into the club and this and that.
"It is important to let him get on with his job and to continue doing the things he was doing last season."
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