Injured Kelly Slater out of J-Bay

World Surf League Champion Kelly Slater has suffered a serious broken foot and has been forced out of the J-Bay surfing event in South Africa.

Posting an image of his shattered foot on Instagram, the surfing champion likened the injury to folding his entire foot backwards.

'I pulled into a barrel this morning and the whitewash bounced the board back into my foot as I hit the closeout, taking all the pressure into the metatarsals,' Mr Slater wrote online.

It's understood he will need to undergo surgery for the injury.

'It sucks but so many people deal with such horrible things around this world everyday that a broken foot is pretty minor in the scheme of things,' Mr Slater said.

'Sometimes a bad thing is a good thing.

'I'll make the best of my time off.'