Sir Elton John's pals are reportedly 'seriously concerned' about the music legend as he works harder then ever amid his ongoing health woes.   

The 77-year-old is fresh off his 330-date Farewell Yellow Brick Road Tour and recently launched new musicals Tammy Faye on Broadway and The Devil Wears Prada in London.

During the West End premiere on Sunday, Sir Elton took to the stage and in an emotional speech spoke about not being able to see the perfomance following his eyesight loss - before being guided off the stage by beloved husband David Furnish, 62.

Now a source has told The Sun: 'Elton's friends are seriously concerned about how much he has taken on and believe it is having a major impact on his health. 

'Quite a few people who he is close to have now encouraged him to slow down because he has been busier than ever this year.

'He isn't getting any younger and his health has been deteriorating in the past few years.

'The whole point of his farewell tour was that he would be home more once it finished, but he is still working to an intense schedule, something has to give.'

MailOnline has contacted Sir Elton's reps for comment. 

During his London speech the Rocket Man singer thanked David for being his 'rock' throughout preparations for the official opening of the show on Sunday, and shared: 'It's hard for me to see it, but I love to hear it.'

He recently admitted he has not been able to see out of his right eye for months, and his left eye 'is not the greatest', following a severe infection. It's not known if the condition is temporary.

Speaking at The Dominion Theatre, Sir Elton said in a clip shared with MailOnline: 'And to my husband who's been my rock because I haven't been able to come to many of the previews because as you know, I've lost my eyesight. 

'So it's hard for me to see it, but I love to hear it - and boy it sounded good tonight. Thank you for coming.'

'It's been four months now since I haven't been able to see. And my left eye is not the greatest. So there's hope and encouragement that it will be okay, but I'm kind of stuck at the moment.

'Because I can do something like this, but going into the studio and recording I don't know, because I can't see a lyric for a start.

'We're taking an initiative to try and get it better, but at the moment that's really what we're concentrating on.'

The acclaimed singer-songwriter candidly went on: 'It's never fortunate for anything like this to happen. And it kind of floored me and I can't see anything, I can't read anything, I can't watch anything.'

However, showing his inherent positive attitude, Elton voiced his gratitude for his life, saying: 'I'm so lucky, I'm the luckiest man in the world.

'I'm so proud of the documentary, I'm proud of my sons, I'm proud of my attitude towards myself and what's going on. I'm just very lucky and very grateful.' 

As well as his current sight issues, Elton has faced a multitude of other health issues, after he had both knees replaced as well his right hip following a fall, which forced him to delay his farewell tour in 2021.

The Rocket Man hitmaker, who played his final shows last summer at Glastonbury, revealed his eyesight issues in September.

He took to his Instagram with a lengthy post, explaining how he spent the past few months 'recuperating at home.'

Elton wrote: 'Over the summer, I've been dealing with a severe eye infection that has unfortunately left me with only limited vision in one eye.

'I am healing, but it's an extremely slow process and it will take some time before sight returns to the impacted eye.

'I am so grateful for the excellent team of doctors and nurses and my family, who have taken such good care of me over the last several weeks.'

Elton concluded: 'I have been quietly spending the summer recuperating at home, and am feeling positive about the progress I have made in my healing and recovery thus far.'