Everton boss Moyes hails Heitinga form turnaround
But Goodison gaffer Moyes said: "John is mentally very strong.
"He's played in a World Cup final and against all the top players, so I think that single-mindedness brought him through.
"He had some real bad periods in the season.
"In a way, he had to prove himself again. If it was anyone else it would have broken them but John's Dutch mentality got him through it."