Novak Djokovic says having a child will be a "huge joy" that will change his priorities, but will also give him motivation.

''This is the start of a new chapter," the world No. 2 said in an interview with Gazzetto dello Sport. "I'm very happy that it happens. When the baby arrives, tennis will not be the first priority."

Djokovic announced on Twitter last week that he and his fiancée, Jelena Ristic, were expecting their first child.

"It will be tiring, but I'm sure it will also give me extra energy and motivation to pursue my career."