‘This is where I spent my last 3 days, in the hospital,’ she wrote.
‘I don’t usually post things like this but I thought I would post this because things that you see on Instagram and all the glamours things that we sometimes post are not always reality and don’t always show the true picture of what is going on so it’s important to show the other side of it as well.
‘I have been working a lot especially in the last few months and unfortunately it caught up with me and I came down with a really bad flu and pneumonia on Monday as well as exhaustion.
‘I had to spend a few days in hospital but I am a lot better now and back at work at the @australianopen. So to everyone out there make sure you take some time for yourself and recharge. Look after yourselves.
‘Thank you to the medical team at the @australianopen ,to everyone at Epworth Hospital Emergency Department and also to everyone at @wwos for looking after me the last few days and making sure I am well and back on my feet as soon as possible.’
There’s no doubt Jelena has been working hard in recent months. As well as her commentary work during the tennis, the star has been working hard to lose weight.
Sharing her inspiring weight loss journey on Instagram, Jelena said: 'Today is my tomorrow. It's up to me to shape it, to take control and seize every opportunity,' she revealed in one of her posts.
'The power is in the choices I make each day. I eat well, I train, I live well. I shape me. It comes down to one simple thing: How bad do you want it?
'Because I want it really bad and I will get it.'
Earlier this months she admitted that her weight had spiked at 120kg - 54kg more than her playing weight of 66kg.
'I was thrown into retirement not knowing what direction I wanted to go in,' she told the Herald Sun of her battle with emotional eating.
Jelena has been showered with well wishes since revealing her recent health battle, with fans cheering her on to make a speedy recovery.
‘We love you Jelena, get well soon,’ wrote one.