The reality star revealed via Snapchat on Tuesday night that he'd been taken to A&E after fracturing his knee during a night out in Loughborough.
And in his column for Daily Star the following day, Gaz revealed just how the nasty injury happened: "I was at a PA in Loughborough on Monday and literally went to take a selfie, leaned over, stood back up, then just felt my knee cave.
"Gone and ruptured the thing. Turns out I fractured a bone. Looks like I am going to be on crutches for a few weeks."
Gaz first alerted fans to his injury via a Snapchat showing him being pushed through the hospital in a wheelchair. A caption read: "Not how you want your night to end."
He later tweeted: "Fractured knee tho. MRI scan on Friday... House bound for me."
Gaz can currently be seen in the fifth series of Ex On The Beach, which airs Tuesdays at 10pm on MTV. The new series of Geordie Shore kicks off on MTV on 25 October.