Havertz says German football shouldn't abandon Ozil after he announced his international retirement earlier this summer.
He told Spox: "I want to evaluate him from a sporting point of view. To question his qualities as a football player is incomprehensible.
"He has always been a player I love to watch and whose career I always followed.
"Mesut Özil is a very good player who has done a lot for the national team and his club team."