Big Brother EXCLUSIVE: Marissa Rancan, 62, was treated for a suspected concussion after challenge

Despite being the oldest housemate in the Big Brother house, evicted star Marissa Rancan was the fiercest competitor in the show’s tough challenges.

And in pursuit of the enviable right to nominate, the 80s aerobics icon suffered a nasty hit to the head.

And the accident nearly landed her in hospital.   

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Speaking to Daily Mail Australia, Marissa, 62, said: ‘They [Big Brother’s medical team] thought I had a concussion.’  

Marissa said after hitting her head twice during a challenge fall, she was observed for a suspected concussion. 

‘They’ve got beautiful medics and doctors on duty 24/7. If you ever need a doctor or something, everyone is on call all the time,’ she explained. 

Marissa said the medics deemed the injury OK and gave her some ice and medication.   

‘We were lucky there was no injuries, just sore muscles and everything like that,’ she said of the housemates so far.   

The challenge, which aired on June 29, saw the contestants compete in an endurance task with their feet pushed up against a disc as they sat on a workout bench.

Once 45 minutes had passed, Marissa attempted to readjust herself on her seat by leaning back.

She fell backwards and shocked her co-stars, telling them: ‘Sorry! I was trying something.’

Big Brother joked at the time: ‘Perhaps lying back isn’t the safest position.’  

Meanwhile, Marissa was sent home with a unanimous 5-0 vote on Monday night in an eviction with Kieran Davidson.

There are now only nine housemates left vying for the $250,000 cash prize.

Australia will vote for a winner later this month during a live finale when there are only three contestants remaining.

Big Brother Australia continues Tuesday at 7:30pm on Channel 10