Novak Djokovic said Friday "it breaks my heart" to see former coach Boris Becker in prison over charges relating to a 2017 bankruptcy, hopes the German legend stays "healthy and strong"

Six-time Grand Slam title winner Becker and Djokovic teamed up for three years until 2017.

they won six majors, a run which included a career Grand Slam when Djokovic won the first of his French Opens in 2016.

It breaks my heart to see him go through this," said Djokovic.

"Boris was always so nice to me and my family, and we had a great relationship throughout the years and achieved great things in this sport.

"I have been in touch with one of his sons, Noah, and asking if there is something that I could do to help. But it's terrible.

World number one Djokovic also said Friday that he wants to return to the Australian Open next year after being deported from Melbourne in January after refusing to get vaccinated.

Since that fiasco, there has been a change of government in Australia and Djokovic is hopeful that a new administration may also mean a fresh look at his visa status.