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 a fierce competitor in the show’s tough challenges.

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

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

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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 fine 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.   

The challenge, which aired on June 29, saw the house 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.’  

When the eviction came between Marissa and Kieran Davidson on Monday night, Marissa was sent home with a unanimous 5-0 vote.

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