Kirsty Gallacher was rushed to hospital after slurring her words live on television and collapsing in the studio.
The Sky Sports News presenter worried fans after they heard her speaking in an unusual way.
Broadcaster Kirsty has since reassured fans that she is alright after it was determined she was suffering from extreme exhaustion and a viral infection.
Just 18 minutes into her TV appearance, she did not return alongside her co-host Jim White.
She was taken to West Middlesex University Hospital after passing out in the corridor of the Sky studios.
A friend told The Sun: “Kirsty was in a bad way. She was unconscious for a long time and doesn’t remember being in the ambulance.”
A source added: “She was feeling terrible on her way to work. She nearly fainted in make-up and thought the adrenaline of the show would see her through.
“But it quickly became apparent that she wasn’t OK. Doctors think it’s extreme exhaustion mixed with a viral infection.”
After the incident, Kirsty tweeted: “Thank you, nasty virus but on the mend.
“Thank you for all your kind messages, feeling bit better, still not 100%. Being ill on live TV is a horrid experience.....
“....thank you to @Westmidhospital for your brilliant care. On the mend & hope to be back on @SkySportsNewHQ asap.”
Some viewers accused Kirsty of being drunk after attending a party with her work colleagues the night before.
However, a spokesperson for the star insisted this was not the case.
They told the Daily Mirror: “She categorically was not drunk. Blood and urine tests at hospital showed no alcohol in her system.”
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