Heitinga arrived at Goodison Park in the summer of 2009 from Atletico Madrid and has spent a significant amount of his time in a Blue shirt playing in midfield.
"Heitinga is great," Westerveld told evertonfc.com. "When he was playing at Ajax everybody was praising him every week. He made the move to Atletico Madrid and I know a lot of people in Spanish football who said he did well.
"In Holland he was a good technical defender and after going to Spain he has made a lot of progress physically.
"He quite quickly managed to do well in England and Everton is a club where new players fit in quickly because of the warm welcome.
"I saw him play for Holland against Sweden this week where he was up against (Zlatan) Ibrahimovic and Ibrahimovic never touched the ball. He is still making progress and he is a great defender.
"He had a great World Cup and hopefully he will have a great season for Everton too."