The stunt was applauded by the crowd and officials, with both fighters smiling at Werdum's little performance.
The pair used to train together and appear to be on good terms ahead of their heavyweight showdown.
Read More:
Kiwi middleweight Israel Adesanya defeats Rob Wilkinson by TKO in UFC debut
Joseph Parker v Anthony Joshua attracts early betting attention
Lean and mean Joseph Parker - 'This fight will change our lives'
Should Werdum beat his opponent Volkov, the 40-year-old Brazilian will look for a shot at the title after losing it against Stipe Miocic.
Jokes aside, Werdum is being tipped as the favourite to claim victory in tomorrows bout.
Everyone saw the funny side of Werdum's little stunt. Photo / Getty ImagesTo get the day's top sports stories in your inbox, sign up to our newsletter here