“It’s all unusual, a rather unexpected call came a few days ago,” Ivanisevic told Serbian reporters at the All England Club, according to sports channel sportklub online.
“I was a bit surprised, I travelled to Sweden. Nole (Djokovic) wanted me to come earlier but I had a senior tour agreed earlier.
“I arrived this morning for the first training session,” the 47-year-old Croatian added.
“Unfortunately it seems I will be able to stay only for the first week since I have obligations again. I’m trying to postpone them,” he said, adding that “when Novak Djokovic calls you, you put many things aside.”
Ivanisevic, Wimbledon champion in 2001, said Djokovic’s appeal was “a big recognition for me as a coach”.
“The first training session was great, we hope that this cooperation will last.”
Ivanisevic has previously coached his fellow countryman Marin Cilic and Milos Raonic of Canada.
Djokovic will be going for a fifth Wimbledon title when the tournament gets underway on Monday