Tim Henman makes feelings clear on Novak Djokovic after tennis star scrapes into Australian Open semi-finals

It means Djokovic is through to the last four, with the 38-year-old still chasing a 25th Grand Slam title that will move him ahead of Margaret Court.

Speaking after the game, Henman made it clear he was worried about Djokovic's consistency.

"He will be disappointed with his level," the TNT Sports expert remarked, noting that Djokovic's performance had been "fairly ordinary."

Henman highlighted an unusual situation where the 38-year-old arrives at the semi-finals physically rested but technically questionable.

"He has just had somebody pull out at two sets to love after a walkover in the previous round, so there is no doubt he is fresh - but now the question mark is his level of play," he observed.

However, Henman refused to write off the 24-time major champion entirely.

"But if there's anyone who can turn it on in the latter stages of a Grand Slam it's Djokovic," he said.

The statistics painted a damning picture of Djokovic's struggles at the Rod Laver Arena.

The veteran committed 32 unforced errors throughout the contest and managed to win merely 39 per cent of points on his second serve.

His service games proved particularly vulnerable, with Musetti breaking through on five separate occasions before his untimely exit.

Djokovic himself acknowledged the Italian had been the "far better player" and admitted he was "lucky" to progress.

The Serb has remarkably failed to claim a single set since the third round, having received a walkover in the fourth round when Jakub Mensik withdrew from their scheduled encounter.

Jim Courier suggested the absence of competitive action in the previous round may have disrupted Djokovic's momentum.

"Maybe it's the day off and a lack of rhythm from not having a match in the fourth round, maybe that threw him off a little bit," the former world No 1 explained.

Courier was blunt in his assessment of where Djokovic should be heading. "He's got work to do, he should be on a plane home," he stated.

The American outlined what he believes Djokovic's preparation should look like ahead of Friday's semi-final against either Jannik Sinner or Ben Shelton.

"If I'm on his team tomorrow, I want him to have a hard hour and play some points and try to get some intensity into it," he said.

Jamie Murray described Musetti's departure as "incredibly unlucky" given the Italian had been "fully in control of that match" while Djokovic appeared completely off his game.

The former doubles world No 1 believes the Serbian will be "breathing a huge sigh of relief" but cautioned that significant improvement is essential against either Sinner or Shelton.

"He's the GOAT for a reason, he will know that's not the right level to go and win the tournament with the players he has potentially got to face," Murray said.