The Dutch goalkeeper feels they've been unfairly criticised with so many senior players missing.
"There was a lot of negativity and rightly so but I think it was also a little bit unfair," he told The Sun.
"We had to cope without Coloccini, Tiote and Remy, Gouffran was injured for a while and, of course, Cabaye leaving was a blow.
"I don't care what people say, they are all big, big players for us and I think people forgot we were missing them during that bad month.
"It is hard for any team to cope when players like that are missing. Now they are back and we've managed to turn it around. They give that extra quality and that showed."
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