An Australian broadcaster has apologised to Novak Djokovic for comments he made on TV that the 24-time Grand Slam champion considered "insulting and offensive".

Channel Nine's Tony Jones shouted "Novak, he's overrated, Novak's a has-been, Novak kick him out" towards Djokovic fans while live on air at the Australian Open on Friday.

As a result, Djokovic refused to do his usual on-court interview after Sunday's fourth-round win over Jiri Lehecka because of Channel Nine being official broadcasters of the tournament.

Speaking at a news conference afterwards, Djokovic said Jones had "made a mockery of Serbian fans and also made insulting and offensive comments towards me".

The 37-year-old added that it "was a very awkward situation for me".

Jones said on Channel Nine on Monday: "I'm disappointed it come to this because the comments were made on the news on the Friday night which I considered to be banter and humour - which is consistent with what I do.

"However, I was made aware on the Saturday morning from Tennis Australia, via the Djokovic camp, that the Djokovic camp was not happy at all with those comments.

"I immediately contacted the Djokovic camp and issued an apology to them – 48 hours ago – for any disrespect which Novak felt I had caused.

"As I stand here now I stand by that apology to Novak if he feels any disrespect, which he clearly does.

"The disrespect extends to the Serbian fans – over the years here there has been colour with them and passion and banter, and I thought that was an extension of that banter. Quite clearly that hasn't been interpreted that way.

"I do feel I've let down the Serbian fans. I'm not just saying that to wriggle out of trouble. I genuinely feel for those fans."